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

    Question

    If 15 men or 10 boys can finish a task in 18 days, how

    long will it take for a team of 12 men and 15 boys to complete the same task? (Calculate approximate value)
    A 15 days Correct Answer Incorrect Answer
    B 8 days Correct Answer Incorrect Answer
    C 32 days Correct Answer Incorrect Answer
    D 21 days Correct Answer Incorrect Answer

    Solution

    According to the question,

    15M = 10B

    Or, 3M = 2B

    Therefore, (12M + 15B) = (8B + 15B) = 23B

    10 boys take 18 days to complete the work

    Therefore, time taken by 23 boys to complete the work = (10 × 18) / 23 = 7.83 days or 8 days

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