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13 September, 13:38

Justin has written 5 novels with an average length of 450 pages. If his sixth novel is 750 pages long, what is the average length of all 6 novels?

A 500 pages

B 550 pages

C 600 pages

D 650 pages

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Answers (1)
  1. 13 September, 15:56
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    Option A: 500 pages

    Explanation:

    1. Number of pages of the first 5 novels

    Average = [Number of pages] / [number of novels]

    450 pages / novel = Number of pages / 5 novels

    Number of pages = 5 novels * 450 pages / novel = 2,250 pages

    2. Average length of all 6 novels

    Average = [Number of pages] / [number of novels]

    Number of pages of 6 novels = 2,250 pages + 750 pages = 3,000 pages

    Average = 3,000 pages / 6 novels = 500 pages / novel
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