Replace the question mark with the correct number in the below-given picture?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?

Find the number of squares in the below-given picture.

How is a fly different from a mosquito?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

How many sides does a circle have?

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?