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      Question

      20 boys can dig a pit in 15 days, while 5 men can dig

      the same pit in 6 days. In how many days will 10 boys and 1 man together dig the pit?
      A 12 days Correct Answer Incorrect Answer
      B 10 days Correct Answer Incorrect Answer
      C 18 days Correct Answer Incorrect Answer
      D 15 days Correct Answer Incorrect Answer

      Solution

      20B × 15 = 5M × 6
      Or, 1M = 10B
      Therefore, 10B + 1M = 10B + 10B = 20B
      Therefore, 20 boys can complete the work in 15 days
      So, 20 boys will complete in  15 days .

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