SOLUTION: the perimeter of a rectangle is 84 cm. the length is twice the width. Find the length and width.

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Question 75370: the perimeter of a rectangle is 84 cm. the length is twice the width. Find the length and width.
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
2l+2w=perimeter
2*2w+2w=84
4w+2w=84
6w=84
w=84/6
w=14 solution for the width.
2*14=28 for the length.
proof
2*28+2*14=84
56+28=84
84=84