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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-20

  • question_answer
    The length of a rectangle is halved, while its breadth is tripled. What is the percentage change in area?

    A)  25% increase    

    B)  50% decrease

    C)  50% increase    

    D)  25% decrease

    Correct Answer: C

    Solution :

    Original length and breath = x and y, then Original area = xy New length and breath\[=\frac{x}{2}\]and 3y, then New area\[=\left( \frac{x}{2}\times 3y \right)=\frac{3}{2}xy\] \[\therefore \]Percentage increase \[=\left( \frac{1}{2}xy\times \frac{1}{xy}\times 100 \right)=50%\]


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