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    Question

    Three boys can do a work in 15 days where as 6 girls can

    do in 12days. What will be the time taken to complete the same work by a teacher if the efficiency of teacher  is 20% more than that of a girls?
    A 65 days Correct Answer Incorrect Answer
    B 60 days Correct Answer Incorrect Answer
    C 72 days Correct Answer Incorrect Answer
    D 45 days Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    3 x B × 15 = 6 x W x 12 B : G= 8:5  Efficiency of a teacher will be = (120 /100) × 5 = 6  Time taken by a teacher will be = (3 × 8 × 15)/6= 60 days

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