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SSC Quantitative Aptitude Percentage Question Bank Percentage (II)

  • question_answer
    A jar contains 10 red marbles and 30 green ones. How many red marbles must be added to the jar so that 60% of the marbles will be red?

    A) 25

    B) 30

    C) 35

    D) 40

    Correct Answer: C

    Solution :

    [c] Let x marbles must be added. Then,    \[\frac{10+x}{40+x}\times 100=60\] \[\Rightarrow \]   \[\frac{10+x}{40+x}=\frac{3}{5}\] \[\Rightarrow \]   \[50+5x=120+3x\] \[\Rightarrow \]   \[2x=70\]\[\Rightarrow \]\[x=35\]


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