If all students from Mr. Chamberlains physical fitness course on page 127 who can do 40 push-ups

Question:

If all students from Mr. Chamberlain’s physical fitness course on page 127 who can do 40 push-ups are asked to do as many sit-ups as possible:
a. How many sit-ups do you expect that each can do? b Will they all be able to do the same number?
c. Explain the meaning of the answer to part a.