book Maths Puzzle Numerical Ability

A rectangular playground is being constructed using a barn as one side and 80 meters of fencing to form the other three sides. What is the maximum area of such an enclosure?

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Question 1:
For #1 - 10, find the area and perimeter of rectangles with the given measurements. Use the common formulas, substitute, and solve.

39 mm wide, 2x mm long
perimete please help me with this problem, I am confused...

y-b=x
---
m

y minus b over m equals x

thank you
John