What does does this rebus picture means ?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

The pound is not a finish.

We are sharing a few instructions below, which you have to use in any suitable order to modify the above sentence such that the end sentence is a scientific fact.

- Eliminate a letter and supplement another in its place.
- Take away one word.
- Remove one letter from one word.
- Get rid of two letters from one word.
- Swap a word with its antonym.

I can be cracked, made, told, and played. What am I?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

I have teeth but i don't bite. Who Am I ?

What is red and smells like blue paint?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?