• 2021 April(Z04) Math Question 51

    Ratios, Proportions, Percentages, Fractions

    - Proportions & Ratios

    Percentage Increase / Decrease, Ratios
    Choice D

    Let the number of people summoned be n:

    Summoned  people  who  appear=40%n=0.4nSummoned\; people \; who \; appear =40\%n=0.4n
    Excused  people={1}{3}(0.4n)Excused\; people =\frac\{1\}\{3\}(0.4n)

    Then,

    Jury  pool={2}{3}(0.4n)Jury\; pool =\frac\{2\}\{3\}(0.4n)

    Jury pool should be 60. So

    {2}{3}(0.4n)=60\frac\{2\}\{3\}(0.4n)=60
    n={3×60×10}{2(0.4)}n=\frac\{3\times 60\times 10\}\{2(0.4)\}
    n=225n=225

    So choice D is correct.

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