J.R. S. answered 03/07/18
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
Perimeter (P) is 2W + 2L
If the width (W) is 13x the length (L), and the W = 5, the L = 5/13 = 0.385 (although not sure from the question which says the width is 13 its length. What does that mean?)
P = (2x5) + (2x0.385) = 10 + 0.769
P = 10.769 inches = 11 inches (to 2 significant figures)