John is the son of Jacob.
So,
Jacob is the_____of John's father?

How many bananas can you eat if your stomach is empty?

What does this say?

XLR8

How can a man go eight days without sleep?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

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

Why is a river so rich ?