It belongs to you, but other people use it more than you do. What is it?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

You see me once in June, twice in November, and not at all in May. What am I?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

I have eight fingers and two thumbs but I do not live. What Am I?

What has many keys but can’t open a single lock?