Can you check please:

1. Joe has used 75 sheets of a pack of notebook paper, which is 5/8 of the entire pack. The equation 5/8 s = 75 can be used to find the number of sheets "s" in a full pack. Determine the solution of the equation, and tell what the solution means.

Ans. 5/8 s = 75
(8/5)*(5/8)s = 75 * (8/5)
= s 120

Does 120 mean that there is a total of 120 sheets of paper in a full pack.

Yes.