A publishing house has two editors. Editor A edits 80 pages/day, B edits 60 pages/day. If a 700-page book needs to be edited, how many days if they work alternately starting with A?
Correct answer: D. 11
- A. 8
- B. 9
- C. 10
- D. 11
Explanation
The problem involves calculating the total pages edited in alternating cycles of two days. Editor A edits 80 pages on the first day and Editor B edits 60 pages on the second day, resulting in a total of 140 pages every two days. In 10 days, they complete 5 cycles, editing 5 * 140 = 700 pages. However, since they work alternately starting with A, the 10th day would be with Editor B, completing 60 pages. On the 11th day, Editor A returns to edit the remaining pages, completing the book. Therefore, 11 days are needed. Options A, B, and C fail to account for the alternating pattern, resulting in incorrect page totals.
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