How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

Solve below rebus puzzle?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Give it food and it will live; give it water and it will die.

What has many teeth, but cannot bite?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

I’m tall when I’m young, and I’m short when I’m old. What am I?