Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

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?

How many times can you subtract the number 5 from 25?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Be active and find the killer in the picture Riddle below.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?