It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Find the next number in the series

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

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

What breaks yet never falls, and what falls yet never breaks?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

John was piloting a plane behind a car but was never able to overtake it. Why?