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A large selection of riddles on various topics for adults and children.

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Mathematical riddles

Riddles for adults and children

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Riddles in Russian | Riddles in Ukrainian

Mathematical riddles in Russian

(8 + 12 - 20) = (10 + 15 - 25)
We take the common factor out of brackets:
4 (2 + 3 - 5) = 5 (2 + 3 - 5)
We reduce (2 + 3 - 5) on each side and get:
4 = 5.
Where is the mistake?

1. How to write the number 100 with six digits 4?
2. How to write the number 100 in seven digits 4?
3. How to write the number 1000 in fifteen digits 4?

45% of the lottery's earnings are spent on paying out winnings.
How many tickets worth 5 francs should the organizers of the lottery distribute if 87 francs are supposed to be spent on paying out the winnings?

Brother Sebastian and brother Tadeusz are bell ringers, their duties include beating time with bells on the town hall tower. On reflection, I realized that their job is not easy. For example, you need to hit five hours in exactly 25 seconds. Based on this, determine how long it will take to strike ten o'clock?

There were some sparrows and some columns. As two sparrows sit on one column, there will be one extra column, and as one sits one at a time, there will be an extra sparrow. How many columns and sparrows were there?

In America, the date July 1, 2003 is written as follows: 7/1/2003, and in other countries: 1/7/2003. If you do not know what format the number is written in, then how many dates in a year can be misinterpreted?

The pet store sells large and small birds. A large bird is twice as expensive as a small one. The lady who went to the store bought 5 big birds and 3 small ones. If she had bought 3 large birds and 5 small ones instead, she would have spent $20 less. How much does each bird cost?

In the month, three Sundays fell on double numbers. What day of the week was the seventh of this month?

Given money - 1 hryvnia.
With this money you need to buy exactly 100 eggs - goose, duck, chicken:
- goose - 5 kopecks / piece;
- duck - 3 kopecks / piece;
- chicken - 1 kopeck / ten.
You need to buy 100 eggs and exactly for the hryvnia - without a trace.

Two freight trains, both 250 m long, travel towards each other at the same speed of 45 km/h. How many seconds will pass after the drivers have met before the conductors of the last cars meet?

Ten dogs and cats were fed 56 biscuits. Each dog got 6 biscuits, each cat - five. How many dogs and how many cats? Try to solve the task without using either a system of equations or a search of options.

To weigh the goods, the seller uses a pan balance and four weights with a total weight of 40 kg. Moreover, using different combinations of weights, you can weigh any load, the mass of which is expressed as an integer number of kilograms (from 1 to 40 kg).
How much does each weight weigh?

Dr. Aibolit distributed 2006 miraculous pills to four sick animals. The rhino got one more than the crocodile, the hippo got one more than the rhinoceros, and the elephant got one more than the hippo. How many pills will the elephant have to eat?

An ancient task on a domestic topic. It was asked to his students by the arithmetic teacher Jacob from Coburg, whose textbook was printed in 1599 in Frankfurt.
The distance between the 2 cities is 260 miles. Two messengers come out from both cities towards each other. One of them daily walk 2 miles more than the other. After 2 days, the messengers meet.
How many miles does each messenger travel daily?

If one and a half hens lay one and a half eggs in a day and a half, how many will two hens lay in two days?

If a person goes to work on foot, and goes back by transport, then in general he spends an hour and a half on the road. If he travels in both directions by transport, then the whole journey takes him 30 minutes. How many times does a person need to travel if he goes to work and back on foot?

There is a cube - black on the outside, but white on the inside. Its height is equal to its width and thickness, and is three cubits.
Tasks:
1. How many cuts will it take to divide a large cube into small cubes only one cubit in size?
2. How many cubes will be obtained after such cutting?
3. How many of the dice will have 4 black sides, how many will have 3, 2, and only one black side?
4. How many small black faces will there be, and how many cubes will be completely white on all sides?

The remarkable Hungarian pop calculator Ferenc Pataki, who is able to mentally multiply 2 three-digit numbers in a matter of seconds, speaking on television in 1979, demonstrated the following trick.
"Multiply your shoe size by 2, add 39 to the product, multiply the resulting amount by 50, add 29 to the product, subtract the year of your birth from the sum," Pataki asked. To the surprise of the audience, each of them received a four-digit number, the first two digits of which meant the shoe number, and the last two - the viewer's age at the end of the calendar year.
Explain the basis of Ferenc Pataky's trick.

From 36 pieces of metal, the turner was instructed to turn 36 amphorae on a lathe. It is known that if you collect shavings from 6 carved amphorae and melt them down, you can carve another amphora out of it. How many unaccounted for amphorae can a turner keep?

From the numbers 5, 5, 5, 1 and simple arithmetic operations "+", "-" "*", "/" you need to get the number 24.

How do you write down the number 3 three times to get 4 in the end?

How to measure 15 minutes, having a seven- and eleven-minute hourglass at hand?

What three numbers, when added or multiplied, give the same result?

When my father was 31, I was 8 years old, and now my father is twice my age. How old am I now?

A flock of geese flew, the uncle saw them and said:
- Apparently, there are a hundred of you!
And the geese answer:
"If there were so many of us,
Yes, there would be so much
And half as much
And a quarter as much
And you would be with us - then there would be a hundred."
How many geese?

The minute hand of a clock is 2 cm long, and the hour hand is 1,5 cm long. Find the ratio of the speeds with which the ends of the hands move.

On Klaus's watch, the minute divisions are marked with small strokes. Glancing at his watch at six o'clock in the afternoon, Klaus found that the large hand was 3 divisions behind the small one.
How much was on the clock?

We are both 63 years old together. I am now twice as old as you were when I was as old as you are now.
How old am I and how old are you?

Write in digits the number consisting of 11 thousand, 11 hundreds and 11 units.

Write 100 with five ones and then five fives.

They found a dime and divided it: for men, one and a half kopecks, for women, a kopeck, and for children, a quarter of a kopeck. How many men, women and children were there?

One biologist discovered an amazing variety of amoebas. Each of them in a minute is divided into two. A biologist puts one amoeba in a test tube, and an hour later the whole test tube is filled with amoeba. How long would it take for the whole test tube to be filled with amoebas if not one amoeba but two were first put into it?

One brick weighs 1 kilogram and another half a brick. How much does one brick weigh?

Once, we involuntarily witnessed the following conversation.
- Did I understand you correctly? You claim that you have been a member of the chess club twice as long as I have.
- Completely correct.
- But as far as I remember, you used to say that you were a member of the chess club three times longer than me?
- Two years ago? But then my experience as a member of the club really was 3 times more than yours, and now only 2 times.
How many years have each of the two interlocutors been members of the chess club?

One woman went to the garden to pick apples. To leave the garden, she had to go through four doors, each with a guard. The woman gave half of the apples she had plucked to the guard at the first door. Having reached the second guard, the woman gave him half of the apples that were left. She did the same with the third guard; and when she shared the apples with the guard at the fourth door (with whom she did as with the previous ones), she had only 10 apples left. How many apples did she pick in the garden?

Here is the expression 987654321=100. Make it correct by using 4 "+" or "-" signs on its left side.

The sawyers cut the deck into meter-long pieces. The length of the deck is 5 meters. Cutting the deck across takes 1,5 minutes each time.
How long did it take to cut the entire deck?

Having traveled a third of the way, the passenger of the fast train finally fell asleep. When he woke up, he had half the distance to his destination station that separated him from his destination when he fell asleep.
What part of the journey did the train cover while the passenger was sleeping?

Five diggers dig a 5 m ditch in 5 hours. How many diggers will dig 100 meters of ditch in 100 hours?

The fish is wonderfully prepared here,
Boiled trout is the king of all dishes.
Order is accepted. All is ready. Bear!
A serving of fish is served on the table.
But what is that noise? The cooks scream
"For a portion, we do not have enough table,
And we could not serve two on the table.
Someone's table would be completely without fish."
You could not name
Us number of servings of trout
And the number of tables
Where cooks are praised?

The seven old women went to Rome. Each old woman has seven donkeys, each donkey carries seven sacks, each sack contains seven loaves, each loaf contains seven knives, each knife in seven sheaths. How many items in total?

The fabulous gnome needs a new candle every night, with which he shines for himself on the road, walking around the city. He can make 1 new candle out of 5 candle stubs. If he has 25 candle ends, how many nights will he have enough new candles to last?

A rock climber stands on top of a smooth, steep rock 100 meters high. At a height of 50 meters there is a ledge where you can make an intermediate stop. The climber has a rope 75 meters long. How will he get off the cliff?

How much is two plus two divided by two?

How many edges does a hexagonal pencil have?

How many times during the day do the minute and hour hands of a clock form a right angle?

How many flowers do I have if all but two are roses, all but two are tulips, and all but two are daisies?

A flock of doves flew up to a tall tree. Part of the doves sat on the branches, while the other settled under the tree. The doves that were sitting on the branches say to those below: “If one of you flew up to us, then you would be three times less than all of us together, and if one of us flew up to you, then you and I would be equal." How many doves sat on the branches and how many under the tree?

The clock hands have just aligned. After how many minutes will they "look" in opposite directions?

The combined age of family members of 4 is 68, and 4 years ago was 53. How old is the youngest member of the family?

Cockroach Valentin announced that he can run at a speed of 50 m / min. They did not believe him, and rightly so: in fact, Valentin mixed everything up and thought that there were 60 centimeters in a meter, and 100 seconds in a minute. At what speed (in "normal" m/min) does the cockroach Valentin run?

Three years ago, Nastya was 7 times older than her sister Veronica. Two years ago, Nastya was 4 times older than Veronica. A year ago, Nastya was 3 times older than Veronica.
How old are Nastya and Veronica?

The three were playing chess. A total of three games were played. How many games did each play?

I have money in two pockets; when I transfer one ruble from one, it will be equal, and when I transfer one ruble from the second to the first, then in the first it will be twice as much as in the second. How many rubles in each pocket?

Write five positive integers whose sum is 20 and whose product is 420.

The owner is sitting on the bank of a pond that is overgrown with weeds. The number of weeds is doubling every day. He's going to start clearing as soon as half the pond is overgrown. A month later, half of the pond was overgrown. How many days does he have to clean up?

The number of three different digits is subtracted from the number that consists of the same digits in reverse order. The result consists of the same three digits, arranged again in a different way. What are these numbers?

Mathematical riddles in Ukrainian

(8 + 12 - 20) = (10 + 15 - 25)
Blame for the bows of the blazing multiplier:
4 (2 + 3 - 5) = 5 (2 + 3 - 5)
Quickly (2 + 3 - 5) from the skin side and obsessed:
4 = 5.
Where is the pardon?

Vidpovid

1. How to write the number 100 with 4 digits XNUMX?
2. How to write the number 100 soma in digits 4?
3. How to write down the number 1000 fifteenth in digits 4?

Vidpovid

45% of the lottery income is used to pay the winnings.
How many vouchers for the 5 francs payment will be distributed by the organizers of the lottery, so that I will be transferred 87 francs to the payment?

Vidpovid

Brother Sebastian and brother Tadeusz are bell ringers, at their bindings they should ring the hour at the town hall. Thinking about it, I realized that working in them is not easy. For example, you need to hit five years exactly in 25 seconds. Vykhodyachi izgogo, you mean, how many will be needed for an hour, to see the tenth year?

Vidpovid

Bulo skіlkis gorobtsіv і sсіlkis stoptsіv.
If you sit down two gorobtsі on one stovpets - there will be one extra stovpets, and if you sit down one at a time - there will be an extra gorobets. Skіlki bulo stovptsіv i gorobtsіv?

Vidpovid

In America, the date of March 1, 2003 is recorded as follows: 7/1/2003, and in other countries: 1/7/2003. If you don’t know, in which format the number is written, then how many dates for the rotation can be incorrect?

Vidpovid

Given pennies - hryvnia.
For the price of pennies, it is necessary to buy exactly 100 eggs - goose, kachinih, chicken:
- geese - 5 kopecks / one;
- kachini - 3 kopecks / item;
- chickens - 1 kopeck / ten.
Buy at least 100 eggs and for a hryvnia exactly - without a decision.

Vidpovid

Two freight trains, offending at a distance of 250 m, travel one to one with the same speed of 45 km / year. How many seconds passed after the drivers started to sound, the conductors of the remaining cars started to sound first?

Vidpovid

Ten dogs and guts were served with 56 biscuits. The skin dog got 6 biscuits, the skin intestines - five. How many bulo dogs and how many guts? Try virishiti zavdannya not vikoristovuyuchi nі systems equal, nі enumeration of options.

Vidpovid

For zvazhuvannya goods, the seller is dressed with cup teres and chotirma weights with a 40 kg wagon. Moreover, vikoristovuyuchi different combinations of weights, you can call any kind of vantage, the mass of which is manifested by a whole number of kilograms (from 1 to 40 kg).
How important is skin weight?

Vidpovid

From 36 pieces of metal, turners, 36 amphoras were entrusted to turn at the Turner's bench. Apparently, if you take shavings from 6 turned amphorae and melt them down, then you can turn one amphora from it. How many unwrapped amphoras can you get yourself a tokar?

Vidpovid

A flying dove flew up to a tall tree. Part of the doves was strong on the needles, and the other part was growing under the tree. The pigeons that were sitting on the hind legs, talking to the quiet, downstairs: "Yakby one of you is angry before us, then you would be three times less, lower us all at once, and one of us is angry with you, then we would be out of you." equally". How many pigeons were sitting on the needles and how many pigeons were under the tree?

Vidpovid

They knew a dime and gave it away: for men a second copy of a penny, for women a copy, and for children a quarter of a penny. How many people, women and children?

Vidpovid

From the numbers 5, 5, 5, 1 and simple arithmetic numbers "+", "-", "*", "/" you need to get the number 24.

Vidpovid

The Kazkov dwarf needs a new candle, which is to light oneself at the road, wanderers around the city. You can make 1 new candle for 5 candle under-burning. If you get 25 short-lived candles in a new year, then for how many nights you need to make a supply of new candles?

Vidpovid

If my father is 31 years old, I was 8 years old, and now my father is older than me. What are my fates now?

Vidpovid

She flew grabbing geese, waggling their uncle like that:
- Mabut, there are a hundred of you!
And the geese say:
- "Yakbi us styles,
That would be the style,
That half is like a style,
That quarter is like a stilt,
That you would be with us, - it would be a hundred and bulo.
Skіlki geese?

Vidpovid

Likar Aibolit gave away 2006 miraculous little birds to ill animals. The rhino won by one more, the crocodile lower, the hippopotamus by one more, the lower rhinoceros, and the elephant - by one more, the lower hippopotamus. How many little piglets torment the elephant?

Vidpovid

Maєmo cube - black zvonі, ale white in the middle. The height of yogo dorivnyu yogo width and tovshchina and become three likti.
Manager:
1. How many cuts do you need to divide the great cube into small cubes with a size of one cubit?
2. How many cubes will be used after such a rosette?
3. Skіlki z dice will be іz 4 black faces, skіlki - z 3, z 2 and z one only black face?
4. Skіlki vyide small black faces and skіlki vyyde cubes, zovsіm bіlih z usіh boіv?

Vidpovid

On the anniversary of Klaus, the goodies were applied with small strokes. Glancing at the yearbook on the sixth year in the afternoon, Klaus revealed that the larger arrow was visible in the small one for 3 gifts.
How many Bulo for the anniversary?

Vidpovid

On the year of the year exactly 9. Through the skіlki khvilin arrows of the year (khvilinna and the year) run?
If an arrow is worthy before, how insulting the arrows run, it is possible to go through x good things, then a good arrow will pass (45 + x) good things in the same hour. Through those that in one and the same hour the arrow is able to pass 1/12 of that which is hvilinna, we can add up equal x \u45d (12 + x) / 4, stars x \u1d 11 cylinders that (XNUMX/XNUMX).

Vidpovid

We are both 63 years old at the same time. At the same time, I’ll have more rocks, what would be the same for you, if there were more rocks of rocks, skils to you at once.
How many fates for me and how many fates for you?

Vidpovid

Write in numbers the number that adds up to 11 thousand, 11 hundreds and 11 ones.

Vidpovid

Write 100 five times in singles, and then five five times in fives.

Vidpovid

One biologist discovered a marvelous variety of amoebas. The skin from them through the quill is divided into two. At the test tube, the biologist puts one amoeba, and in a year the whole test tube appears filled with amoeba. How long would it take for the entire test tube to be filled with amoebas, for the yakbees to put not one amoeba, but two, on the cob?

Vidpovid

Once, we passed by and became evidence of an offensive move.
- Chi correctly I you zrozumov? You are strong, that you are a member of the checker's club, you are older, lower.
- Completely correct.
- But how can I remember, having said earlier that I was a member of the checker's club three times more, lower?
- Two fates to that? And yet, my experience as a member of the club is 3 times more than yours, and less than 2 times at a time.
How many fates of the skin from two spivrozmovniki can be a member of the checker's club?

Vidpovid

One woman went to the garden to pick an apple. To get out of the garden, it was necessary to go through four doors, with a guard standing at the skin of them. The guards at the first door of the woman gave half of the apples she had picked. After reaching another guard, the woman gave him half of the apples that were gone. So she did it to the third guard; and if the woman shared apples with the guard at the fourth door (with which they made her like that in front), then only 10 apples were left in her. How many apples did she pick in the garden?

Vidpovid

One zeglina is important for 1 kg and more zeglini piv. How much do you need one zeglin?

Vidpovid

Before you is viraz 987654321=100. Zrobіt yogo vіrnim, vikoristovuyuchi 4 signs "+" or "-" at yogo lіvіy part.

Vidpovid

The sawyers cut the deck on the meter of the cut. Dovzhina logs 5 meters. Cutting the deck across the board takes about 1,5 hvilin an hour.
How many hours did it take to cut all the decks?

Vidpovid

Having passed the third way, the passenger of the Swedish train fell asleep. If I had slipped through, to the station of confession, I had to go through half of the dead station, which would have made it up to the station of confession, if I had fallen asleep.
Yaku part way through the train while the passenger slept?

Vidpovid

Five diggers for 5 years dig 5 m of a ditch. How many diggers can dig 100 m of ditch in 100 years?

Vidpovid

Riba is wonderful to cook from here,
Boiled trout is the king of all dishes.
Accept the request. All is ready. Carry!
Serve in portions of ribey on the table.
Ale scho there for gamir? Then shout the cooks,
"We don't get a table for a portion,
I wouldn’t be able to pay taxes on the table.
I would have left the steel of someone who is called without ribi.
You would not be fooled to name
Us the number of servings of trout
І number of tables
There, de praise the cooks?

Vidpovid

Sim women went to Rome. In a skin woman, according to these donkeys, a skin donkey, according to this bear, in a skin bear, according to this bread, in a skin bread, according to this knife, and a skin low, according to this bear. How many objects?

Vidpovid

The skeleton climber should stand on the top of a smooth stream of rock with a height of 100 meters. At a height of 50 meters there is a ledge, on which you can grow an intermediate tooth. Skelelas has a skewer with a length of 75 meters. How can I get down from the rocks?

Vidpovid

Skіlki bude: two plus two add to two?

Vidpovid

Skіlki in me kvіtіv, yakscho all of them okrim two - trojandi, all okrim dvoh - tulips, and all okrim dvoh - daisies?

Vidpovid

How many faces does a hexagonal olive have?

Vidpovid

How many times to improve doby hvilinna and year arrows of the year to make a straight kut?

Vidpovid

An old problem on a poboot topic. Її asking his teachings the arithmetic teacher Jacob z Coburg, whose assistant was instructed in 1599 p. at Frankfurt.
Vіdstan mіzh 2 places to become 260 miles. From both places nazustrich one goes 2 ginsya to one. One of them can go 2 miles higher, lower one. After 12 days, the gints are zestrichayutsya.
How many miles to pass every day a skin messenger?

Vidpovid

The arrows of the yearbook just got off. Through skіlki khvilin stench will "marvel" at the opposite side?

Vidpovid

The total age of members of the family is 4 people are healthy 68, and 4 years ago they are 53. How old are the youngest members of the family?

Vidpovid

Targan Valentin voiced, scho vmіє bigati zі swidkіst 50 m / min. They didn’t believe you, and rightly so: in fact, Valentin mixed up everything and thought that there are 60 centimeters in a meter, and 100 seconds for a hvilin. What kind of swedishness (in "normal" m / w) large targan Valentin?

Vidpovid

Three years ago Nastya was 7 times older than her sister Veronica. Two years ago, Nastya was 4 times older than Veronica. Рік ago Nastya bula is 3 times older than Veronica.
Skіlki rokіv Nastya and Veronitsa?

Vidpovid

Three of them played checkers. Usyi played three games. How many party skins?

Vidpovid

Pet stores sell great and small birds. The great bird is dearer than the small one. The lady who went to the store bought 5 great birds and 3 little ones. Yakby won't buy 3 great birds and 5 small ones, then she would spend 20 dollars less. How many skin birds?

Vidpovid

I have a penny in two intestines; if from one I transfer one karbovanets, then I will be equal, and if from the other I transfer one karbovanets to the first, then in the first there will be two more, lower in the other. Skіlki in the skin pocket of carbovants?

Vidpovid

At the month, three weeks fell on the guys' numbers. Which day of the week of the eighth day of the month?

Vidpovid

Indicate five positive numbers, the sum of which is equal to 20, and the additional number is 420.

Vidpovid

The owner is sitting on a birch bar, overgrown with weeds. Today the number of bur'yanіv podvoyuєєtsya. Winnings are selected for a rozchishchennya, as only half the rate is overgrown. A month later, half the rate was overgrown. How many days does the new one have for cleansing?

Vidpovid

The hvilinna arrow of a year old can be 2 cm long, and the year is 1,5 cm.

Vidpovid

The number of three different digits is taken from the number, which is added up from the digits themselves, sorted out in the reverse order. The result is summed up from the quiet of the three numbers themselves, re-stashed anew in a different way. What are the numbers?

Vidpovid

Ferenc Pataky, a wonderful Ugrian estradny counter, who for a few seconds thought to multiply 2 three-digit numbers, speaking in 1979. on TV, demonstrating the offensive trick.
"Multiply your sum by 2, add up to 39, multiply the withdrawn amount by 50, add up to 29, see from the sum of the rivers of your people," Pataki asked. Surprisingly looking at the skin of them, having gained a different number, the first two digits of which mean the number of the same, and the two remaining ones - for the first time, like a calendar rock.
Explain what the focus of Ferenc Pataky is on.

Vidpovid

How do you see 15 hvilin, looming under the hand of the 7th 11th dog year?

Vidpovid

How is it necessary to write down the number 3 so that the pouch has 4?

Vidpovid

Like three numbers, how to add them up or multiply them to give the same result?

Vidpovid

If a person goes to work, and then back on a transport, then in general, on the road, it’s stained for the second time. Well, if in obedience in the country of wines on transport, then the whole way is borrowed in a new 30 hvilin. How many hours do people need on the road, like a job and back there will be more money?

Vidpovid

How many cocks lay a second egg in a second day, how many two cocks lay in two days?

Vidpovid

All thematic puzzles for adults and children:

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Smartphone Nokia Lumia 1520 26.11.2013

The new Nokia Lumia 1520 features a 6-inch Full HD IPS display (1920 x 1080 pixels, 368 ppi pixel density), a Qualcomm Snapdragon 4 quad-core 800 GHz processor with Adreno 2,2 graphics, and a 330 mAh battery. mAh, which provides up to 3400 hours of talk time in 27,4G networks, up to 2 hours of music playback, up to 124 hours of video playback or up to 10,8 days of standby time.

The device is equipped with a 20 MP camera with PureView technology. Sensor size is 1/2,5 inch. Lens - Carl Zeiss with 6 elements. The camera is equipped with PureView technology and optical stabilization function.

In terms of shooting, the novelty has inherited the capabilities implemented in the flagship smartphone Nokia Lumia 1020 (the ability to zoom, center and crop photos, as well as simultaneously shooting in high and low resolution modes). The Nokia Lumia 1520 also includes the Nokia Camera app, which lets you control exposure, shutter speed, ISO, white balance, and focus.

The Lumia 1520 runs Windows Phone 8 GDR3 with a Nokia Black add-on. Built-in memory is 32 GB, there is support for microSD memory cards. The device supports wireless charging.

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