Can you convert the number zero(0) into a positive number using just one mathematical operator ?

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.

What you cannot hold but it is yours?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

I have eight fingers and two thumbs but I do not live. What Am I?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?