Question

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

Answer 1

• Option A: 500 pages

Step-by-step 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