What number do you get when you multiply all of the numbers on a telephone's number pad?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

The centre of the third figure is empty. What digit should fit inside?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What always comes into a house through the keyhole?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Why do we preferably have round manhole covers and not square ones?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Our product and our sum always give the same answer. Who are we?