What does this Rebus Picture mean?

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

what's the probability of getting a king or a queen from a pack of 52 cards?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

What is the fastest way to double your money?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

Can you solve the maths in the below-given picture equation?

I’m tall when I’m young, and I’m short when I’m old. What am I?