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

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

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?

In the image below, can you find the value of an angle(y)

Can you make four (4) nines (9) equal 100?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

How do you go from 98 to 720 using just one letter?

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.

What is red and smells like blue paint?

Why is a river so rich ?