Funny math riddles

Right now Mum is 21 years older then her child In 6 years her child will be 5 times younger than she. Where is daddy?

If you had a pizza with crust thickness ‘a’ and radius ‘z’, what’s the volume of the pizza?

What do you get if you add 2 to 200 four times?

If 5 Rats eat 5 cheese in 5 seconds.
How many seconds would it take 4 Rats to eat 4 cheese ?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.
What is the maximum marks ?

I know a number which is spelled in an alphabetical order.
Do you ?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Which is the smallest number that you can write using all the vowels exactly once.?

Use only one mathamatical symbols and all numbers (0-9) to get sum of 99

I went to the book shop and spent one half of the money that was in my purse.
When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

Alexander is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.
There are cliffs around the island, so he cannot jump off.
How can the Alexander survive the fire? (There are no buckets or any other means to put out the fire)

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

When is 1500 plus 20 and 1600 minus 40 the same thing?

What 3 positive numbers give the same result when multiplied and added together?

A bat and a ball cost $1.10. The bat costs one dollar more than the ball. How much does the ball cost?

When I take five and add six, I get eleven, but when I take six and add seven, I get one. What am I?

There are 12 kids in a classroom. 6 kids are wearing socks and 4 are wearing shoes. 3 kids are wearing both. How many are bare feet?

Divide 20 by half and add 30, what do you get?

If Mr. Flynn is 90 centimeters plus half his height, how tall is he?

How can you give someone $83 using exactly 7 bills, without using any one dollar bills?

What number do you get when you multiply all of the numbers on a telephone’s number pad?

There are two fathers and two sons. They walk into a candy store and each buys a candy bar for 50 cents. The total for all of the candy bars was $1.50. How is that possible?

Joe has ten coins totaling $1.19. From these coins, he cannot make exact change for a dollar, half-dollar, quarter, dime, or nickel.
What are the coins?

What do mathematics teachers like to eat?

Dean Sam and Castiel are three brothers. Interestingly their current age is prime. What’s more interesting that difference between their ages is also prime. How old are they?

In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half the lake?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

How many days are there in 4 years?

The combined age of Jack and John is 49. Jack is twice as old, as John was when Jack was as old as John is now. How old are the brothers?

If you go to the movies and you’re paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

Three times what number is no larger than two times that same number?

How can you add eight 8’s to get the number 1000?

You have 14 brown socks, 14 blue socks and 14 black socks in your sock drawer. How many socks must you remove (without looking to be sure) to have a matched pair?

Mr. Smith has 4 daughters. Each of his daughters has a brother. How many children does Mr. Smith have?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation.

There are 25 red balls, 47 green balls and 3 blue balls in a basket. There is a blind man. What is the minimum number of balls that the blind man has to pick to make sure that there are at least 2 balls of different colors?

Place three matches on a table. Tell a friend to add two more matches to make eight.

One brick is one kilogram and half a brick heavy. What is the weight of one brick?

What did one math book say to another?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

My daughter has many sisters. She has as many sisters as she has brothers. Each of her brothers has twice as many sisters as brothers. How many sons and daughters do I have?

In a bicycle race, the man who came two places in front of the last man finished one ahead of the man who came fifth. How many contestants were there?

If you’re 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

An apple is 40 cents, a banana is 60 cents and a grapefruit is 80 cents. How much is a pear?

I am four times as old as my daughter. In 20 years time I shall be twice as old as her. How old are we now?

If two hours ago, it was as long after one o’clock in the afternoon as it was before one o’clock in the morning, what time would it be now?

Sally is 54 years old and her mother is 80, how many years ago was Sally’s mother three times her age?

If it is two hours later, then it will take half as much time till it’s midnight as it would be if it were an hour later. What time is it?

Mom and dad have four daughters, and each daughter has one brother. How many people are in the family?

What is half of two plus two?

In two years I know, I’ll be twice as old as five years ago, said Tom. How old is Tom?

How many 9’s are there between 1 and 100?

There is a three digit number. The second digit is four times as big as the third digit, while the first digit is three less than the second digit. What is the number?

Add me to myself and multiply by 4. Divide me by 8 and you will have me once more. What number am I?

I am a number with a couple of friends, quarter a dozen, and you’ll find me again. What am I?