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Discussion :: Area

  1. A towel, when bleached, was found to have lost 20% of its length and 10% of its breadth. The percentage of decrease in area is:

    2. A.

    10%
    B.

    10.08%
    C.

    20%
    D.

    28%

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    Answer : Option D

    Explanation :

    Let original length = x and original breadth = y

     

    Decrease in area =XY-[\( \frac { 80} { 100 }\)xx\( \frac { 90 } { 100 } Y]\)

                           

                                =[xy-\(\frac { 18 } { 25 }XY ]\)

                               

                               =\( \frac { 7 } { 2 5}\)xy

     

     Decrease % =[\( \frac { 7 } { 2 5}\)xy x \( \frac { 1 } { XY } \)x100]%=28%

     

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