By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

Prove that twice of ten is the same as twice of eleven.

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

Which is the correct shadow of the bird?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?