To fill an order on schedule, a manufacturer had to produce 1,000 tools per day for n days. What is the value of n ?
(1) Because of production problems, the manufacturer produced only 600 tools per day during the first 5 days.
(2) Because of production problems, the manufacturer had to produce 1,500 tools per day on each of the last 4 days in order to meet the schedule.
答案是E
不是C就可以解出N=9了嗎？
難道還有其他解？
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