SOLUTION: The perimeter of rectangle is 240cm if it's length decreased by 1o% and the breadth is increased by 20% we get the same perimeter. Find the original length and breadth of the recta

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Question 1036586: The perimeter of rectangle is 240cm if it's length decreased by 1o% and the breadth is increased by 20% we get the same perimeter. Find the original length and breadth of the rectangle
Answer by ikleyn(52781) (Show Source):
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The perimeter of rectangle is 240cm if it's length decreased by 1o% and the breadth is increased by 20% we get the same perimeter.
Find the original length and breadth of the rectangle
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x + y = 120, (1) ( 120 = ) 0.9x + 1.2y = 120. (2) Multiply eq. (1) by 0.9 and distract from the eq. (2). You will get 0.3y = 120 - 108, 0.3y = 12, y = = 40. Answer. The width was 40 cm, the length was 120 - 40 = 80 cm.