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

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Can you decipher the below rebus?

PBLUESAISNUERSES

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

If 1+9+8=1, what is 2+8+9?

Can you fill the blank with the correct number?

6 30 870 756030 _____

When it is alive we sing, when it is dead we clap our hands. What is it?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.