A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

All of you like to eat me. I am a five-lettered word. Remove the first two and I turn into an infamous animal. Remove just the first and I become a heinous crime. Remove the first and the last and you can groove on me.

Can you guess who am I?

Can you start the fire using two pieces of wood?

There are forty elephants and they have forty-fore heads. How can this be possible?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

What is the fastest way to double your money?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

With the help clues provided in the image, can you find the 5 digit key?

Buy me, smell me or deliver me, I do not change.

Who am I?