how do i solve problems like these...

1) The sides of a rectangle are in the ratio 5 : 7 and the perimeter of the rectangle is 96 cm. what is the area of the rectangle?

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how do i solve problems like these...

1) The sides of a rectangle are in the ratio 5 : 7 and the perimeter of the rectangle is 96 cm. what is the area of the rectangle?

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## Answers (1)

let

x = scale factor

5x = width

7x = length

so

2(5x + 7x) = 96

x = 4

and area is:

(5·4)(7·4) = 560 cm

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