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

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

How many times can you subtract the number two from the number fifty?

How can you take 2 from 5 and leave 4?

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

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Why 1729 is a magic number? Answer Logically.