If 21x = 79x, what is the value of x?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

What kind of tree can you carry in your hand?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

What word does this rebus represent?

meta meta
meta meta

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Can you name some countries which do not have the alphabet 'A' in them?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What always comes into a house through the keyhole?