What occurs twice in a week, once in a year but never in a day?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

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?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Why are televisions attracted to people?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?