Which is the rope you never skip with?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Can you replace the question mark with the correct number?

Can you find a rabbit in the given picture?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

Can you solve the below tricky visual equation?