Can you replace the question mark with the correct number?

Solve this riddle by finding the odd one out from the rest.

What can go up a chimney down, but can't go down a chimney up?

John decided to give his bike 3 coats of paint. Which coat would go on the first?

10+10 and 11+11 can give you the same answer.

Explain how?

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

Why did Navjot Singh Sidhu put the new January calendar in the freezer

Which is heavier: a ton of bricks or a ton of feathers?

Dwayne Johnson was running away with the loot from a heist in his car along with Vin Diesel. One tire was punctured and he dropped down to replace it. While changing the wheel, he dropped the four nuts that were holding the wheel and they fell into a drain. Vin Diesel gave him an idea using which they were able to drive till the rendezvous point.

What was the idea ?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____