Question

The ratio of the length to width of a rectangle is 5:8. If the width of the rectangle is 42 inches, what is the perimeter of the rectangle, to the nearest tenth?

Answer 1

Usually the length is longer than the width, but we'll do it your way.
w/42 = 8/5
w = 67.2
p = 2(42 + 67.2) = 218.4