You need to arrange three 7 and mathematical symbols to form number 1?

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?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Replace the question mark with the correct number in below Picture:

What does this mathematical rebus means ?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

Using Only Five 5's and any mathematical operator make sum as 37

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 ?

What's a single-digit number with no value?