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

I’m tall when I’m young, and I’m short when I’m old. What am I?

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?

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?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Can you count the number of triangles in the given figure?