SOLUTION: the sides of a rectangle are in the ratio 5:7,and its perimeter is 120 cm.whats the area of the rectangle

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Question 871453: the sides of a rectangle are in the ratio 5:7,and its perimeter is 120 cm.whats the area of the rectangle
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x%2Fy=5%2F7 and 2x%2B2y=120, and not matter which you take as width and which as length. Two equations in two unknowns. Simplify the perimeter equation first, and then use the ratio to find a substitution.