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

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

How can you leave a room with two legs and return with six legs?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

Why is a river so rich ?

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

Can you count the number of lines in the below picture?