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SSC Quantitative Aptitude Percentage Question Bank Percentage (II)

  • question_answer
    The wheat sold by a grocer contains 10% low quality wheat. What quantity of good quality wheat should be added to 150 kg of wheat so that the percentage of low quality wheat becomes 5%?

    A) 50 kg

    B) 85 kg

    C) 135 kg

    D) 150 kg

    Correct Answer: D

    Solution :

    [d] Low quality wheat \[=\left( \frac{10}{100}\times 150 \right)kg\] \[=15\,\,kg\] Let x kg of good quality wheat be added to it. \[\frac{15}{(150+x)}\times 100=5\] \[\Rightarrow \]   \[\frac{15}{150+x}=\frac{5}{100}=\frac{1}{20}\] \[\Rightarrow \]   \[150+x=300\] \[\Rightarrow \]   \[x=150\] \[\therefore \] 150 kg of good quality wheat is to be added.


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