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

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

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

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

What has to be broken before you can use it?

What has many keys but can’t open a single lock?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?