Prove that the below maths equation is true.

8 + 8 = 91

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What do you think with the below Picture ?

Replace the question mark with the correct number below.

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Who has married many women but was never married?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

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?