You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

What can you hold in your right hand, but never in your left hand?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

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?

What can you see in the middle of March and April that you can never see in any other month?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?