Replace the question mark with the correct number in below Picture:

If an electric train is travelling south, then which way is the smoke going?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

A girl says this to her best friend: “I was born in 1955, and I celebrated my 17th birthday last weekend.” Her best friend thinks she’s lying, but she’s actually correct. How is that possible?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

Solve the puzzle by telling what does below picture means.

You need to remove two matchsticks to make the below equation true. Can you do it ?