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      Question

      18 men can finish a work in 15 days by working 8 hours

      a day. How many more men are needed to finish the work in 12 days by working 6 hours a day?
      A 8 Correct Answer Incorrect Answer
      B 10 Correct Answer Incorrect Answer
      C 12 Correct Answer Incorrect Answer
      D 14 Correct Answer Incorrect Answer

      Solution

      Let the efficiency of a man be 'x' units/day. Let number of extra men needed to finish the work be 'y'. ATQ; Total work = (18 + y) Γ— x Γ— 12 Γ— 6 = 18 Γ— x Γ— 15 Γ— 8 Or, 18 + y = 30 So, y = 30 βˆ’ 18 = 12 Therefore, the number of extra men required = y = 12

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