Math and Logic Puzzles - Famous math puzzles - Math puzzles with answers for adults

Pizza Puzzle

A math teacher went for a walk!! Went to eat pizza in a restaurant in the evening!! He saw the menu and ordered a 9 inch pizza!! After sometime the waiter appeared in front of Guruji with two 5 inch round pizzas and said, Sir! 9 inch pizza is not available, so you are being given two 5 inch pizzas each, so you get 1 inch pizza extra for free! The maths teacher kindly asked the waiter to call the owner of the restaurant!!

When the owner of the restaurant came, Guruji asked him very lovingly, how educated you are? The owner said, Sir! I am post graduate. Guruji again asked that till where have you studied maths? The owner said, Sir! Till graduation!! Then Guruji said that can you tell me what is the formula to find the area of ​​a circle in maths? 

The owner said, Sir "πr²"

Guruji said, OK

Pizza Slice Puzzle

Further he said, Now where = 3.142857 and r is radius of the Circle.

I ordered you a 9 inch diameter pizza, which according to the formula has an area of ​​63.64 Square inches! am i right? The owner said, Yes! Exactly right!

Now Guruji further said that you have given me two 5 inch pizzas by saying that you are being given 1 inch free pizza, now find the area of ​​one 5 inch pizza!!

The area was calculated, which turns out to be "19.64 Square Inches" i.e. the area of ​​2 pizzas is 39.28 Square Inches!! Now Guruji said that even if you give me a third 5 inch pizza, I will still be in loss!! And you are saying that I am being given 1 inch pizza for free!!

The owner of the restaurant is silent!! Poor people don't make any answer!! In the end he saved his life by giving Guruji 4 pizzas of 5 inches each!