How many times can you subtract the number two from the number fifty?

Riddle me this, Riddle me that,
What am I? I am made of wood, but you can't see me down?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

If six children and two dogs were under an umbrella, how come none of them got wet?

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 get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

I don't get anymore wetter, no matter how much rain falls on me.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

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