What does this mathematical rebus means ?

Solve the mathematical equation in the picture below.

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

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?

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

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

What has hands, but can’t clap?