New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    If the efficiency ratio of A, B, and C is 7:9:11, and B and

    C together can finish a task in 10 days, then how much time will A and B need to complete it?
    A 10.2 days Correct Answer Incorrect Answer
    B 16.5 days Correct Answer Incorrect Answer
    C 19.5 days Correct Answer Incorrect Answer
    D 12.5 days Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let efficiencies of A, B, and C be 7x, 9x, and 11x units/day respectively.

    Total work = (9x + 11x) × 10 = 200x units

    Required time = 200x ÷ (7x + 9x) = 200x ÷ 16x = 12.5 days

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