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

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles, and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

What month of the year has 28 days?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

If an electric train is travelling south, then which way is the smoke going?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Why did Navjot Singh Sidhu put the new January calendar in the freezer

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

Imagine you are in a room with no windows or doors. How will you get out?