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4 May, 09:19

There are 32 students in a class. They are taking either biology or chemistry or both. The

number of students taking biology is three times as many as the number of students

taking chemistry. If 4 students are taking both biology and chemistry, how many

students are in biology?

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Answers (1)
  1. 4 May, 11:49
    0
    27

    Step-by-step explanation:

    Let's call the number of students taking chemistry x which makes the biology students 3x. Since the overlap is 4 the amount of students who take chemistry only or biology only is x - 4 and 3x - 4 respectively therefore we can write:

    x - 4 + 3x - 4 + 4 = 32

    4x - 4 = 32

    4x = 36

    x = 9

    Since x = 9, the amount of biology students is 3x which is 3 * 9 = 27.
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