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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 × 23 = 4140 units

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