A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

How many triangles are there in the picture below?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?