Why Aeroplane windows are round?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

What does this mathematical rebus means ?

Find out the number of circles in the given picture having Illusion

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What does this rebus means ?

PROG WORKRESS

Solve the mathematical equation in the picture below.

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

While sitting in the Car, John suddenly finds that one of the wheels was missing. John noticed that a killer is approaching towards him. John cannot get out of the car.

How will John escape?