Question 1021084
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The length of a rectangle is three times its width. 
If the perimeter of the rectangle is 48 cm, find its area.
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For similar solved problem see the lesson <A HREF=http://www.algebra.com/algebra/homework/Points-lines-and-rays/Solved-problems-on-the-perimeter-and-side-lengths-of-a-rectangle.lesson>Solved problems on the perimeter and side lengths of a rectangle</A>, Problem 2 in this site.

Consider it as a sample. Read it attentively.

Then solve your problem by applying the same logic and substituting your data.
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