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

I am white when I am dirty, and black when I am clean. What am I?

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

What does this mathematical rebus means ?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Can you fill the blank with the correct number?

6 30 870 756030 _____

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?