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      Question

      If one child has half the work efficiency of an adult,

      determine the duration required for 8 children to construct a wall, which is 60% as large as the one built by 12 adults in 15 days.
      A 27 days Correct Answer Incorrect Answer
      B 21 days Correct Answer Incorrect Answer
      C 18 days Correct Answer Incorrect Answer
      D 15 days Correct Answer Incorrect Answer

      Solution

      Let the efficiency of each man be '2x' units/day So, total work = 2x X 12 X 15 = '360x' units And efficiency of a child = 2x ÷ 2 = 'x' units/day So, required time = (360x X 0.6) ÷ (8 X x) = 27 days Hence, option a.

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