What will you call your mother's brother's brother-in-law?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What does below Rebus mean ?

esgg sgeg gegs gsge

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?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Why do people go to bed?

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?