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      Question

      If Neha can complete a work in 40 days by working 5 hours a

      day, how many hours per day should she work to complete the same work in 25 days?
      A 10 hrs Correct Answer Incorrect Answer
      B 8 hrs Correct Answer Incorrect Answer
      C 12 hrs Correct Answer Incorrect Answer
      D 24 hrs Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the efficiency of Neha be 'x' units per hour

      Therefore, total work = 5 × 40 × x = 200x units

      Let the time she should work to complete the work in 25 days be 'y' hours a day.

      ATQ;

      200x = 25 × y × x

      Or, y = 8

      Therefore, she should work for 8 hours a day.

      Alternate solution:

      Required time = (5 × 40) ÷ 25 = 8 hours

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