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Railways Sample Paper RRB (Assistant Loco Pilot & Technician) Sample Test Paper-12

  • question_answer
    Seats for Mathematics, Physics and Biology in a school are in the ratio \[3:5:6.\] There is a proposal to increase these seats by \[20%\], \[30%\] and \[50%\] respectively. What will Be the ratio of increased seats?

    A)  \[36:65:47\]                  

    B)  \[65:25:80\]

    C)  \[35:47:90\]        

    D)      \[36:65:90\]

    Correct Answer: D

    Solution :

     Originally, let the number of seats for Mathematics, Physics and Biology be \[5x,7x\] and \[8x\] respectively. Number of increased seats are (\[120%\]of\[3x\]), (\[130%\]of\[5x\]) and (\[150%\]of\[6x\]). \[\Rightarrow \] \[\left( \frac{120}{100}\times \,3x \right)\],     \[\left( \frac{130}{100}\,\,\,\,\,\,5x \right)\] and      \[\left( \frac{150}{100}\,\,\,\,\,\,6x \right)\]   \[\therefore \]  The required ratio \[=36x:6.5x:9x\] \[\Rightarrow \]   \[36:65:90.\]


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