Question 1036586
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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 = {{{240/2}}} )
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 = {{{12/0.3}}} = 40.

<U>Answer</U>. The width was 40 cm, the length was 120 - 40 = 80 cm.
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