I am quite hot but become too cold if you remove the first two letters. What am I?

Name a key which is hardest to turn.

What does this rebus riddle means ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?