A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

How far can you walk into the woods?

During which month do people sleep the least?

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

I look at you, you look at me, I raise my right, you raise your left. What am I?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Which number should replace the question mark?

You need to move three matchsticks to form three squares. Can you do it?

You need to remove two matchsticks to make the below equation true. Can you do it ?