[求助]是OG出错了 ，还是翻译问题？

感悟晨尘

      OG 中有一道数学题，是这样的：

    A marketing firm determined that, of 200 households surveyed, 80 used neither Brand A nor Brand B soap, 60 used only Brand A soap, and for every household that used both brands of soap,3 used only Brand B soap. How many of the 200 households surveyed used both brands of soap?

.   在它的解析中：

     It is also given that 60 households use only Brand A and that three times as many households use Brand B exclusively as use both brands.

     请问这个 three times （三倍）是从哪看出来的？还是印刷问题啊？我买的可是正版书啊！

     欢迎指教

hanheli

题中说的是,"for every household that used both brads of soap, 3 used only B soap",就是说,两种都用的家庭和只用B的之间有一个3倍的关系.

解析中不过是换了一种说法,只用B肥皂的家庭是两种都用的三倍.

感悟晨尘

   大侠，太感谢了！我是新手还不是很熟悉这里面的功能，刚看到解答，这题我都迷惑好久了。这是迟到的言谢，相当得谢谢！！！！！