Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

A cat, a dog and a monkey were stolen. 3 suspects got caught: Harish, Manoj and Tarun. All we know is each person stole one animal, but we do not know who stole which. Here are the investigation statements. Harish said: Tarun stole the cat. Manoj said: Tarun stole the dog. Tarun said: They both were lying. I did not steal the cat or the dog. Later on, the police found out the man who stole the monkey told a lie. The man who stole the cat told the truth. Can you find out who stole which?

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?

What is always in front of you but can’t be seen?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?