What does the below rebus puzzle mean?

Can you replace the question mark with the correct number in the below table sequence?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

There is something which is always coming but never arrives?

500 women soldiers are arranged in an array of ten rows and fifty columns in accordance with their respective heights. Now, the tallest woman from each row is asked to move out in the front. From them, the shortest one is labelled as Alpha. They are then asked to resume their original position.

Now, the shortest woman in each column is asked to come out in front. The tallest among them is labelled as Beta.

Can you find out if Alpha will be taller or Beta?

James bond was pushed out of an aeroplane without any parachute.
He survived, How come?

I am an odd number. Take away a letter and I become even. What number am I?

What is the Surname of Barbie Doll?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?