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      Question

      During a week, the first six days recorded an average

      rainfall of 140 cm, and the last six days had an average of 148 cm. Given that the weekly average was 145 cm, find the rainfall on the sixth day.
      A 454 cm Correct Answer Incorrect Answer
      B 585 cm Correct Answer Incorrect Answer
      C 329 cm Correct Answer Incorrect Answer
      D 713 cm Correct Answer Incorrect Answer

      Solution

      ATQ,

      Total rainfall for the first six days = 140 ร— 6 = 840 cm

      Total rainfall for the last six days = 148 ร— 6 = 888 cm

      Total rainfall for the week = 145 ร— 7 = 1015 cm

      Rainfall on the sixth day = {(840 + 888) โ€“ 1015} = 713 cm

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