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

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Find the missing value of "?" in the letter sequence below.

CAD
EBG
KBM
OCR
DDH
NL?

Forwards I am heavy, backward I am not. What am I?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

What can go up a chimney down, but can’t go down a chimney up?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.