Replace the question mark with the correct number in the below-given picture?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

What is so fragile that saying its name breaks it?

James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally James would like the fishing rod to arrive in one piece!

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What is the riddle which can be asked all day with a different correct answer each time.

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Can you find the odd one out from the below words ?

First Second Third Forth Fifth Sixth Seventh, Eighth Nine Ten Eleven Twelve.