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?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

What does below Rebus say?

XLR8

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

How can a man go eight days without sleep?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Which tank will fill first?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?