Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Can you find out the remainder when 3^300 is divided by 5?

The dirtier I get, the whiter I look. Who am I?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

I always drive my customer away.

Who am I?

I know a nine-letter word having only one vowel.
Do you ?