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    Question

    It takes a team of either 20 boys or 35 girls, 27 days

    to achieve a sales target. How many days will it take for a team consisting of 21 boys and 42 girls to complete the entire sales target?
    A 10 days Correct Answer Incorrect Answer
    B 18 days Correct Answer Incorrect Answer
    C 12 days Correct Answer Incorrect Answer
    D 15 days Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let efficiency of a boy and a girl be 'b' units/day and 'g' units/day, respectively. According to question, 20b = 35g 4b = 7g Total amount of targets = 20b × 27 = 540b units 21 boy and 42 girls = 21b + 42g = 21b + 6 × 7g = 21b + 24b = 45b Hence Desired time = (540b/45b) = 12 days

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