八月JJ请教67题

ninaluan · 发表于 2003-8-20 14:45:00

67. 某人有bookcase, arrange 10 books per shelf and no books left. If he acquired 10 additional books, and arrange 12 books per shelf, no books left. Ask how many books he has before acquiring the addition 10 books
A before acquiring, his books less than 96
B before acquiring, his books more than 24
参考答案：a
思路：请问怎么想？谢谢！

心静 · 发表于 2003-8-20 15:55:00

1）设原来为10X，后来为12M，则：10X+10=12M，推出10X=12M-10，
2）X= 6M/5-1=（5M+M）/5-1=M+（M/5）-1，所以得出M定是5的倍数，
3）M最小为5，当M=5时，10X=50；M=10，10X=110（超过A的范围）
所以，原来为50本

八月JJ请教67题

八月JJ请教67题

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