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

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

How can you make a TV, a bed, a dog, and a car liquid?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

How can you tell a raw egg from a hard-boiled egg?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

What is the next number in this matchsticks series riddle?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?