Can someone break this down for me? The length of a rectangle is 2 times its width. The perimeter of the rectangle is 90 cm. What are the length and width? HHHHHHHHHHHEEEEEEEEEEELLLLLLLLLLLPPPPPPPPPPP!

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by WolvesofJesonae at February 16, 2011

The thing is, I looked up how to solve it, but I don't understand how and why they used those steps. They went like this:

l = length w = width

2(l + w) = 90

2(2w + w) = 90

2(3w) = 90

6w = 90

6w ÷ 6 = 90 ÷ 6

w = 15

l = 30

Well, let me put it this way, I don't understand where they got 2(2w + w) = 90 from. Especially the 2 on the outside of the parenthesis.