Rebecca R. answered • 08/29/18

Tutor

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Elementary school math tutor with experience in Common Core.

Hi, Sara

Okay, so the width is 5 less than 3 times the length (L)

So,

L = Length

Width = 3L - 5

P = 2L + 2W

P = 2L + 2(3L - 5)

= 2L + 6L - 10

= 8L - 10

Since the Perimeter = 70

8L - 10 = 70

8L = 80

L = 10

Width = 3L - 5 = 30 - 5 = 25

So,

Length = 10 in

Width = 25 in