Question

    Four boys and nine girls can

    complete a task in 24 days. Three boys and five girls can finish the same task in 36 days. How many days will it take for six boys and six girls to complete the same task?
    A 18 days Correct Answer Incorrect Answer
    B 21 days Correct Answer Incorrect Answer
    C 25 days Correct Answer Incorrect Answer
    D 32 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let no of boys be 'b' and no of girls be 'g' (4b+9g)24 = (3b+5g)36 (4b+9g)2 = (3b+5g)3 8b+18g = 9b+15g b = 3g 21g × 24 = 24g × number of days taken Number of days taken = 21 days

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