What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Replace the question mark in the picture below.

Why is 6 afraid of 7?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

When it's bad luck to meet a black cat?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

What is common among 11, 69, and 88?