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  1. The breadth of a rectangular plot is decreased by 20 per cent. By what percent should the length be increased to keep the area same?
    1. 25
    2. 20
    3. 30
    4. None of these
Correct Option: A

0 = x – 20 –
20x
100

Net effect = x + y +
xy
 %
100

⇒ x - 20 -
x
 = 0
5

⇒ 5x – 100 – x = 0
⇒ 4x = 100
⇒ x = 25%


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