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

which number am I?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.