How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

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

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

How many words can a pen with half refill write?

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

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?