Why Aeroplane windows are round?

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

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
=========
T O W E L
=========

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

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

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?