Why is a river so rich ?

Find the value of "?" in the ball picture Riddle below:

What Adam and Eve do not have but the rest of the people have?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

When it's bad luck to meet a black cat?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What does this rebus riddle means ?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?