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

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

I know a nine-letter word having only one vowel.
Do you ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

If you say my name, I will no longer exist. What am I?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

The dirtier I get, the whiter I look. Who am I?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Can you solve this picture maths equation?