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?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

Why is 6 afraid of 7?

Which tank will fill first?

What you cannot hold but it is yours?

Count the squares in the matchstick puzzle below?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Make a sentence consisting of three words that have the whole alphabet.

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?