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?

Can you place six X (crosses) in below board without making three in a row in any way ?

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Can you count the number of matches in the picture below ?

Next Number in the Series,

5, 16, 49, 104, ?

If a wheel has 54 spokes, how many spaces are there between the spokes?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What breaks yet never falls, and what falls yet never breaks?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?