### Fun Facts (Hints)

Mathematics has an extensive history in just about every culture or civilized society known to man. Listed below are some cool facts to get those math juices flowing:
In 1852 mathematician JJ Sylvester established the "theory of algebraic invariants."
In 1995 math great Andrew Wiles, proved "Fermat's Last Theorem."
The first decimal number system is said to have been invented in Ancient Egypt around 5000BC.
The Ancient Mayan civilization located in Central America is one of the only cultures in the recorded history of the world to use a place-value number system.
The American Mathematical Society was formed in the late months of 1888 in New York.

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Riddles and Answers © 2022

This collection compiled by our staff on a regular basis will provide you with a great way to workout that math brain power, and will hopefully benefit you in your studies.

This is an awesome collection for anyone ages 5 and up, and contains a comprehensive set of riddles related to math for a wide range of audiences.

How many of these convoluted math riddles do you think that you can solve? Try out our collection, and be sure to come back regularly to solve our newly added math brain teasers.

## I Bought A Cow For 800 Riddle

I bought a cow for $800.

I sold it for $1000.

I bought it again for $1100.

I sold it again for $1300.

How much did I earn?

I sold it for $1000.

I bought it again for $1100.

I sold it again for $1300.

How much did I earn?

Hint:

## Two Ships Riddle

Two ships leave the port of San Diego, both sailing for the distant shores of Japan. Each ship plans to travel the same route, spending a two-week stopover in Tokyo before returning to California. The first ship churns through the sea at 35 miles per hour throughout the entire journey. The second ship moves slower, at just 30 mph. After two weeks in Tokyo, the captain of the second ship decides to run at a faster pace, moving at 40 mph for the entire return trip. Which ship arrives in San Diego first?

Hint:

The first ship!

First ship = d/35 + d/35 = 2d/35 = 0.0571d

Second ship = d/30 = d/40 = 70d/1200 = 0.058

YES NO

First ship = d/35 + d/35 = 2d/35 = 0.0571d

Second ship = d/30 = d/40 = 70d/1200 = 0.058

*Did you answer this riddle correctly?*YES NO

## Two Ships Riddle

Two ships leave the port of San Diego, both sailing for the distant shores of Japan. Each ship plans to travel the same route, spending a two-week stopover in Tokyo before returning to California. The first ship churns through the sea at 35 miles per hour throughout the entire journey. The second ship moves slower, at just 30 mph. After two weeks in Tokyo, the captain of the second ship decides to run at a faster pace, moving at 40 mph for the entire return trip. Which ship arrives in San Diego first?

Hint:

The first ship!

First ship = d/35 + d/35 = 2d/35 = 0.0571d

Second ship = d/30 = d/40 = 70d/1200 = 0.058

YES NO

First ship = d/35 + d/35 = 2d/35 = 0.0571d

Second ship = d/30 = d/40 = 70d/1200 = 0.058

*Did you answer this riddle correctly?*YES NO

## A Grandmother Two Mothers And Two Daughters Riddle

A grandmother, two mothers and two daughters went to the cafe for some coffee. They ordered one cup each. What was the total number of cups that they ordered?

Hint:

They ordered three cups, one for each person. The grandmother is also a mother and the mother is also a daughter.

Another solution: They ordered two cups. Both are mothers and daughters and one is a grandmother.

YES NO

Another solution: They ordered two cups. Both are mothers and daughters and one is a grandmother.

*Did you answer this riddle correctly?*YES NO

## How Many Times Can You Subtract 5 From 25 Riddle

Hint:

Only one time. After that, you would be subtracting from 20.

YES NO

*Did you answer this riddle correctly?*YES NO

## Mary Has 4 Daughters Riddle

Mary has four daughters, and each of her daughters has one brother. How many children does Mary have?

Hint:

Mary has four daughters. Let x be the daughter.

Four daughters mean - x + x + x + x

Each of her daughters has one brother - let y be the son.

Total children => x + x + x + x + y. => 5

She has Total 5 children, all of her daughters have the same 1 brother.

YES NO

Four daughters mean - x + x + x + x

Each of her daughters has one brother - let y be the son.

Total children => x + x + x + x + y. => 5

She has Total 5 children, all of her daughters have the same 1 brother.

*Did you answer this riddle correctly?*YES NO

## If You Take 3 Apples From 10 Apples Riddle

Hint:

Three.

If you take 3 apples from 10 apples, you are simply left with 3 apples.

Many people confuse themselves with the mathematical equation, subtracting three apples away from 10 and therefore equaling an answer of seven apples. This is incorrect.

You did not have any apples to begin with. So by taking 3 apples from 10 apples, you therefore now have 3 apples.

YES NO

If you take 3 apples from 10 apples, you are simply left with 3 apples.

Many people confuse themselves with the mathematical equation, subtracting three apples away from 10 and therefore equaling an answer of seven apples. This is incorrect.

You did not have any apples to begin with. So by taking 3 apples from 10 apples, you therefore now have 3 apples.

*Did you answer this riddle correctly?*YES NO

## 10 Apples In A Basket Riddle

There are 10 apples in a basket. There are 10 people. Each person takes an apple but there is still one apple left in the basket. How can this be?

Hint:

## A Man Buys A Goat For $60 Riddle

A man buys a goat for $60. Then sells it for $70. Then he buys it back at $80 but sells is again for $90.

How much did he make?

How much did he make?

Hint:

He made $20. $10 the first time, $70 - $60 = $10, and $10 the second time, $90 - $80 = $10, for a total of $20.

YES NO

*Did you answer this riddle correctly?*YES NO

## A Man Steals 1000 From A Shop Riddle

A man steals $1000 from shop, spends $700 in same shop and gets $300 change. Now how much did shop owner gets loss?

Hint:

We can easily solve this mathematical problem by using the following mathematical process.

Initial loss amount = Rs. 1000

Now, we have to calculate the recovered amount,

As the man spends Rs. 700 in the shop, the shop owner will surely provide the man goods/services of Rs. 700. So, nothing will be recovered in this case.

Now, the man gave Rs. 1000 against the goods/services of Rs. 700 and got Rs. 300 change, so there will be no recovering of money for the shopkeeper.

Final loss = Initial loss - Recovered amount = 1000-0 = Rs. 1000

YES NO

Initial loss amount = Rs. 1000

Now, we have to calculate the recovered amount,

As the man spends Rs. 700 in the shop, the shop owner will surely provide the man goods/services of Rs. 700. So, nothing will be recovered in this case.

Now, the man gave Rs. 1000 against the goods/services of Rs. 700 and got Rs. 300 change, so there will be no recovering of money for the shopkeeper.

Final loss = Initial loss - Recovered amount = 1000-0 = Rs. 1000

*Did you answer this riddle correctly?*YES NO

## 7 Men Have 7 Wives Riddle

Hint:

If 7 men have 7 wives that simply means there are 7 coupled, so that is 7 +7 = 14.

Then, if each couple has a child, that's 14 + 7 = 21.

So the total number of people is 21.

YES NO

Then, if each couple has a child, that's 14 + 7 = 21.

So the total number of people is 21.

*Did you answer this riddle correctly?*YES NO

## If Eleven Plus Two Equals One Riddle

Hint:

11 o'clock plus 2 hours = 1 o'clock

9 o'clock plus 5 hours = 2 o'clock

YES NO

9 o'clock plus 5 hours = 2 o'clock

*Did you answer this riddle correctly?*YES NO

## What Remains When The Roads Are Gone Riddle

A race car driver has completed 12 1/2 laps of a 50-lap race. What fractional part of the race remains?

Hint:

Let's take a look at the explanation of the riddle.

As per the total laps in the race are 50 and the driver has completed 12 1/2 laps. This means, we have to subtract 12 1/2 from the total 50 laps. This equal to 37 1/2 or 37.5

50 - 12 1/2 = 37 1/2 or 37.5

Now, we need to calculate the fractional part of the race remains. For this, we need to divide the remaining laps by total laps, that is, 37 1/2 divide by 50 or 37.5 divided by 50 which will be equal to 0.74 or 3/4.

37 1/2 / 50 = 0.74 or 3/4

Hence, the right answer to the riddle is 3/4

YES NO

As per the total laps in the race are 50 and the driver has completed 12 1/2 laps. This means, we have to subtract 12 1/2 from the total 50 laps. This equal to 37 1/2 or 37.5

50 - 12 1/2 = 37 1/2 or 37.5

Now, we need to calculate the fractional part of the race remains. For this, we need to divide the remaining laps by total laps, that is, 37 1/2 divide by 50 or 37.5 divided by 50 which will be equal to 0.74 or 3/4.

37 1/2 / 50 = 0.74 or 3/4

Hence, the right answer to the riddle is 3/4

*Did you answer this riddle correctly?*YES NO

## McDonalds Riddle

A brainteaser involving what looks like some simple math with McDonald's burgers and fries has left people starving for the correct answer. Can you solve this McDonalds riddle?

Hint: The key is to first determine how much each item is worth. The drink is clearly worth 10, and it's apparent from the second line that the burgers are worth five.

Pictures of the fries are each worth two, but you have to keep in mind that each individual packet of fries is worth one when you get to the next line. That has baited people into thinking, incorrectly, that the last line is 5 + 2 x 10.

The fourth line has also thrown many people off because it involves order of operations after already including the tricky single packet of fries.

Multiplication comes before addition, so you have to multiply one packet of fries by one drink and then add that to one burger. Thus, 5 + (1x10) = 15.

YES NO

The fourth line has also thrown many people off because it involves order of operations after already including the tricky single packet of fries.

Multiplication comes before addition, so you have to multiply one packet of fries by one drink and then add that to one burger. Thus, 5 + (1x10) = 15.

*Did you answer this riddle correctly?*YES NO

## Clock Calculator Bulb Riddle

Hint:

Find the value of one clock using the first equation. According to first equation, 9’o clock + 9’o clock + 3'o clock = 9 + 9 + 3 = 21.

Therefore; 1 Clock = 1

Using equation two, three calculators are equal to 30. Therefore, one calculator is equal to 10.

Also, the sum of numbers inside the calculator is 1 + 2 + 3 + 4 = 10.

Therefore, the value of the calculator depends on the sum of the numbers inside it.

According to equation three, 1 Bulb + 1 Bulb - 1 Bulb = 15.

Cancelling out the + and -; we get 1 Bulb with five lights = 15

.

Therefore, one bulb with one light = 3.

Bulb with four lights = 4 x 3 = 12.

The final equation is - 9’o clock + Calculator (1+2+2+4) x 3 bulbs (with four light rays each)

Translating the final equation into numbers - 9 + (1+2+2+4) x 3(12)

9 + 9 x 36 = 9 + 324 = 333.

Answer to 'Watch Calculator bulb' puzzle is 333.

YES NO

Therefore; 1 Clock = 1

Using equation two, three calculators are equal to 30. Therefore, one calculator is equal to 10.

Also, the sum of numbers inside the calculator is 1 + 2 + 3 + 4 = 10.

Therefore, the value of the calculator depends on the sum of the numbers inside it.

According to equation three, 1 Bulb + 1 Bulb - 1 Bulb = 15.

Cancelling out the + and -; we get 1 Bulb with five lights = 15

.

Therefore, one bulb with one light = 3.

Bulb with four lights = 4 x 3 = 12.

The final equation is - 9’o clock + Calculator (1+2+2+4) x 3 bulbs (with four light rays each)

Translating the final equation into numbers - 9 + (1+2+2+4) x 3(12)

9 + 9 x 36 = 9 + 324 = 333.

Answer to 'Watch Calculator bulb' puzzle is 333.

*Did you answer this riddle correctly?*YES NO

## Post Your Math Brain Teasers Below

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