In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

What has to be broken before you can use it?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

A Shopkeeper sold a few chickens to four different customers on a particular day. It was such that each customer purchased half of the remaining chickens and half the chicken more.

Can you find out how many chicken were sold by the shopkeeper on that day if we tell you that the fourth customer bought a single chicken ?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

I am white when I am dirty, and black when I am clean. What am I?

Can you make four (4) nines (9) equal 100?