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 ?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What has 88 keys?

Find the missing number in the image below.

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

What have one eye but still cannot see?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Which Burger Is Different in below image?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?