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

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

What can jump higher than a building?

What brings you down but never up?

Which digit occurred maximum times between the number 1 and 1000?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?