Can you make four (4) nines (9) equal 100?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

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.

The Federal bank of London is abducted by the robbers. The head of the robbers asked the cashier to empty their money vault to them and when suddenly cashier got a call from her father. To avoid any suspicion, the robber asked the cashier to pick the call and reply her father in the shortest manner possible.

The cashier told her father "Is there an emergency father, Call me when you are free and I will help you in your furnishing" and then the cashier hung up the phone.

After 10 minutes, police arrived at the crime scene.

How did the police know about the robbery?

What four weights can be used to balance from 1 to 30 pounds?

What does this Rebus Picture mean?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

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?

What number when divided in half becomes zero?