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

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Give it food and it will live; give it water and it will die.

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

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

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

Trying to tease Birbal, Akbar gave him one gold coin and ask him to buy
* something for him to eat
* something for him to drink.
* something to feed the cows
* something to plant in the garden
and most important you need to buy only one thing.

What must Birbal buy to silence Akbar?

John went to buy some expensive, foreign chocolates. He only had Rs 100 with him. When he reached the shop, he got out and know that on those chocolates, there was a 15% import duty and 5% VAT.

How much worth chocolate should he buy so that he can accommodate it in Rs 100?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

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