What is the centre of gravity?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

What always comes into a house through the keyhole?

Replace the question mark with the number below given a simple math problem.

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?