What is the fastest way to double your money?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

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?

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