What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

What is next number in the pattern below:

131 517 192 123 ?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

10+10 and 11+11 can give you the same answer.

Explain how?

Can you tell a 3D object that has just two surfaces?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

When can we add 2 to 11 and get 1 as the correct answer?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

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?