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题库 / GMATAdvanced-DS-10
In the first 2 hours after Meadow's self-service laundry opens, m large washing machines and n small washing machines are in continual use. Including the time for filling and emptying the washing machines, each load of laundry takes 30 minutes in a large washing machine and 20 minutes in a small washing machine. What is the total number of loads of laundry done at Meadow's self-service laundry during this 2-hour period?
(1)n=3m
(2)2m+3n=55
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
坑爹啊。。。。。2m+3n=55只有一种整数解
我去 哭= =
咦不对啊，可以是m=2,n=17; 也可以是m=5,n=15。。。好多解呢？？
不好意思我这个回答不正确，应该是根据题意要求4m+6n的值，正好就是2*(2m+3n)=110，仍然是个坑爹的题。。。。。。。。。。。
哈哈谢谢~
120/30*m+120/20*n=4m+6n=2*(2m+3n)=2*55=110
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