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267.In warehouse there are some boxes divided in stacks, each has 12. After adding 60 more, each has 14. How many boxes before adding? 1)boxes<110 before adding2)boxes<120 after adding
讨论:B;设以前为X,x=12a, 12a+60=14b, 条件1,12a<110, 满足前提的有a=2, a=9,不成立,条件2,14b<120,满足只有a=2。
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