SOLUTION: A rectangle has a perimeter of 90 m. It is twice as long as it is wide. Find the rectangle's dimensions.

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Question 184893: A rectangle has a perimeter of 90 m. It is twice as long as it is wide. Find the rectangle's dimensions.
Answer by Earlsdon(6103) About Me  (Show Source):
You can put this solution on YOUR website!
Start with the formula for the perimeter of a rectangle:
P+=+2%28L%2BW%29 where L = Length and W = Width.
The problem states that "It is twice as long as it is wide", so...
L+=+2W Substitute into the formula:
P+=+2%282W%2BW%29 and P = 90 m, so...
90+=+2%283W%29 Divide both sides by 2.
45+=+3W Divide both sides by 3.
15+=+W so...
W+=+15m. and L+=+30m.