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.

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Why is it very easy to weigh a fish?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Can you find out the missing number in the grid?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

What is the fastest way to double your money?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?