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.

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

I have feet, but no legs. Which animal Am I?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?