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      Question

      The average electricity consumption of a household over

      a number of months was 180 units. In the next month, it consumed 300 units, raising the average by 5 units. Find the total units consumed before the last month.
      A 4140 Correct Answer Incorrect Answer
      B 4200 Correct Answer Incorrect Answer
      C 4100 Correct Answer Incorrect Answer
      D 4300 Correct Answer Incorrect Answer

      Solution

      Let the number of months before be 'P'.

      Units before = 180P

      (180P + 300) / (P + 1) = 185
      => 180P + 300 = 185P + 185
      => 5P = 115 => P = 23

      Total units = 180 Γ— 23 = 4140 units

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