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

I am quite hot but become too cold if you remove the first two letters. What am I?

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

What happened when the wheel was invented?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What is the word or phrase below?
R | E | A | D

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?

What does below chemistry rebus means?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?