When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

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?

If six children and two dogs were under an umbrella, how come none of them got wet?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

I shave every day, but my beard stays the same. What am I?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?