There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

What can you serve, but never eat?

I cannot talk, but I always reply when spoken to. What am I?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Why blonde cannot dial 911?