What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

John was piloting a plane behind a car but was never able to overtake it. Why?

O_er_t_o_

Complete the missing letters of the given word.

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

I have no life, but I can die. What am I?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

What is black when you buy it, red when you use it, and gray when you throw it away?

10+10 and 11+11 can give you the same answer.

Explain how?

What is the next number in the series?

15 29 56 108 208 ?

Why Aeroplane windows are round?