Who has married many women but was never married?

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

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

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?

I have branches, but no fruit, trunk or leaves. What am I?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

How can you write nineteen in a manner that if we take out one, it becomes twenty?

You can hear me, but you can't touch or see me.

What am I?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?