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 ?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Which is faster, Heat or Cold ? Explain.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

0 0 0 = 6
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

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?