Question

A rectangle with a perimeter of 78 millimeters has a length and width in a ratio of 9:4. What are the length and width?

Answer 1

Explanation:

Let the length be 9x, then the width is 4x

perimeter = 2(9x + 4x) = 2(13x) = 26x = 78, so x = 78/26 = 3

So

the length = 9x = 9(3) = 27 mm

the width = 4x = 4*3 = 12 mm.