If eleven plus two equals one, what does nine plus five equal?

Which is faster, Heat or Cold ? Explain.

A man dies of old age on his 25 birthday. How is this possible?

Give it food and it will live; give it water and it will die.

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

You have a thousand Re. 1 coins with you. You have ten bags with you and you can put any number of coins in each of the bags. The condition is that if someone asks you for any amount between 1 and 1000, you must be able to give that amount by just giving the bag (you are not allowed to open the bag and give coins).

How will you do it?