Rich G. answered 03/11/19
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Experienced Algebra Tutor at High School and College Level
Make w = width
Since the length is 5 times the width, L = 5w
The formula for perimeter is
P = 2L + 2w
Since the perimeter is 48 and L = 5w
P = 2L + 2w
48 = 2(5w) + 2w
48 = 12w
Solve for w and then solve for L