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    Question

    In a class, 70% of the students

    are adults, and 40% of the adults are females. If the number of adult males in the class is 105, what is the total number of students in the class?
    A 320 Correct Answer Incorrect Answer
    B 225 Correct Answer Incorrect Answer
    C 250 Correct Answer Incorrect Answer
    D 235 Correct Answer Incorrect Answer

    Solution

    ATQ, Let total number of students in the class be '100a'. So, number of adults in the class = 100a X 0.7 = '70a' And, number of adult females in the class = 70a X 0.4 = '28x' So, number of adult males in the class = 70a - 28a = '42a' ATQ; 42a = 105 Or, a = 2.5 So, total number of students in the class = 100 × 2.5 = 250

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