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The ratio between the perimeter and the breadth of a rectangle is 5 :1 . If the area of the rectangle is 216 cm2. what is the lenth of the rectangle?

Correct Answer: 18 cm
2(l + b)/b = 5/1 = > 2l + 2b = 5b = > 3b = 2l = >b = (2/3)l Then, Area = 216 cm^2 = > l x b = 216 = > l x (2/3)l = 216 = >l = 18 cm.

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