The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I have no life, but I can die. What am I?

What can you hold in your right hand, but never in your left hand?

What is the centre of gravity?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

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?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

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 ?