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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-11

  • question_answer
    The length and breadth of a rectangle are 20 m and 15 m respectively. If length is increased by 20% and the breadth by 30%, the percentage increase in its area is

    A)  54%                           

    B)  56%               

    C)  50%                 

    D)         52%               

    Correct Answer: B

    Solution :

    Area of rectangle, \[A=20\text{ }m\times 15\text{ }m=300\,{{m}^{2}}\]. increased area, \[A'=\left( 20+\frac{20}{100}\times 20 \right)\,\left( 15+\frac{30}{100}\times 15 \right)\] =24x19.5-468m2. % increase in area \[=\frac{468-300}{300}\times 100=56%\]


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