I am white when I am dirty, and black when I am clean. What am I?

Can you find out the remainder when 3^300 is divided by 5?

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 begins with T, ends with T, and has T in it?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Can you place three balls such that the equation shown in the picture holds true?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?