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Math

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in a group of 30 students,20 are male,15 are from southern region,9 from the central and 6 from the north.if the proportion of female students is the same for each region,how many students are either female or from the central{or both}A.9 B.10 C14 D.16 E.19

  • Math -

    since 2/3 of the students are male, that means that 2/3 of each region are male.

    1/3 of each region are female, meaning that there are

    9 students from central
    5 female from south
    2 females from north

    16 are female or from central. (D)

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