math
posted by Judy .
Mr. Cook wants to fence his rectangular garden which covers 100 ft squared. The width of the garden is 7 and 1/2 ft. What is the length of the garden? How much fencing will Mr. Cook need?

A = LW
100 = 7.5x
100/7.5 = 13.333
P = 2L + 2W
Take it from there.