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.

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Which is heavier: a ton of bricks or a ton of feathers?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

What number should come in place of the question mark below?

Count the squares in the matchstick puzzle below?

If 1+9+8=1, what is 2+8+9?