Why is a river so rich ?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

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

Replace the question mark with the correct number below.

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

Identify the hidden meaning behind this picture?

Why is the Hole below a Lock?

Can you move 2 matchsticks to form four equal sized squares.

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!