Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What have one eye but still cannot see?

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

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

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 have no life, but I can die. What am I?

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?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you, man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?