貌似很简单的题，我咋跟答案完全理解的不一样涅？
求指导。
多谢！
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.
但是答案是：
【答案】E
【思路】
(1)前五天
一個方程式,兩個未知數,無法求解…..insufficient
(2)後四天
一個方程式,兩個未知數,無法求解…..insufficient
(1)+(2)
沒有講中間幾天…..insufficient
我跟答案的偏差，主要在：
我理解因为题干说“ produce 1,000 tools per day for n days”，条件A,B都是有“production problems”，所以每天的产量有变化，中间那几天没说有“production problems”，我就默认它按照原计划产量生产了。
这样理解为什么不对？
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