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      Question

      14 chefs can cook 21 meals in 7 hours. How much time will

      10 chefs take to cook 30 meals?
      A 25 hrs Correct Answer Incorrect Answer
      B 10 hrs Correct Answer Incorrect Answer
      C 14 hrs Correct Answer Incorrect Answer
      D 28 hrs Correct Answer Incorrect Answer

      Solution

      ATQ,

      Let the efficiency of each chef be 'x' meals per hour

      Let the required time be 't' hours

      Therefore, (14x × 7) / 21 = (10x × t) / 30

      Or, t = (14x × 7 × 30) / (10x × 21) = 14

      Required time = 14 hours

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