A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

You need to arrange three 7 and mathematical symbols to form number 1?

Using eight eights and addition only, can you make 1000?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

What is the centre of gravity?

At a Society election for president, precisely 963 votes were cast.
There is a total of 4 candidates that participate in the election.

The winning candidate exceeds the opponents by 53, 79 and 105 votes.

How many votes do each candidate gets?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

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

A father's child, a mother's child, yet no one's son.

Who am I?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.