Can you start the fire using two pieces of wood?

How many letters are in the alphabet?

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

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

The more it dries, the wetter it becomes. Can you tell what it is?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?