There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I have branches, but no fruit, trunk or leaves. What am I?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

People put me on the table and cut me but do not eat me. What am I?

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?

You are driving down the road in your car on a wild, stormy night, when you pass by a bus stop and you see three people waiting for the bus

An old lady looks as if she is about to die.
An old friend who once saved your life.
The perfect partner you have been dreaming about.
Knowing that there can only be one passenger in your car, whom would you choose?

There is something which you can be arrested for attempting but not for successfully completing.