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      Question

      In a town, the average rainfall for the first four days of

      a week was 105 cm, while the average for the last four days was 112 cm. If the weekly average rainfall was 110 cm, determine the rainfall on the fourth day.
      A 54 cm Correct Answer Incorrect Answer
      B 85 cm Correct Answer Incorrect Answer
      C 98 cm Correct Answer Incorrect Answer
      D 71 cm Correct Answer Incorrect Answer

      Solution

      ATQ,

      Total rainfall for the first four days = 105 × 4 = 420 cm

      Total rainfall for the last four days = 112 × 4 = 448 cm

      Total rainfall for the whole week = 110 × 7 = 770 cm

      Rainfall on the fourth day = {(420 + 448) – 770} = 98 cm

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