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      Question

      A region observed an average rainfall of 130 cm during the

      first four days of a week, while the last four days had an average of 135 cm. If the total weekly average was 133 cm, find the rainfall on the fourth day.
      A 150 cm Correct Answer Incorrect Answer
      B 185 cm Correct Answer Incorrect Answer
      C 129 cm Correct Answer Incorrect Answer
      D 115 cm Correct Answer Incorrect Answer

      Solution

      ATQ,

      Total rainfall for the first four days = 130 ร— 4 = 520 cm

      Total rainfall for the last four days = 135 ร— 4 = 540 cm

      Total rainfall for the whole week = 133 ร— 7 = 931 cm

      Rainfall on the fourth day = {(520 + 540) โ€“ 931} = 129 cm

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