A rectangle has a width that is twice the length. The perimeter of the rectangle is 30 inches. What is the length and the width?

Question

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Answer 1

Let the length be L so the width is 2L and the perimeter is 2(length+width)=6L=30 in; so length L=5 in and width=10 in.

Answer 2

Let x = length, then 2x = width

Perimeter = 2(length) + 2(width)

So, 2(x+2x) = 30
6x= 30
x =5

Length = x = 5 inches

Width = 2x = 10 inches

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