【Emerald开楼】专属数学问题贴
麻烦大家帮我解答一下OG第二十一页的6题题干。有一句and for every household that usd both brands of soap,3 used only Brand B soap. 3 used only Brand B soap的解释是three times as many households use Brand B exclusively as use both brands. 这是什么表述方法？在其他题里面还有没有出现过类似的表达方式？如果有的话能不能把具体在个地方和题号发给我？谢谢了！ 楼主，请按照版主要求，把题目出处与题号在标题里列出来。也请你把整题登出来。
很多时候，题目已经有人问过，所以请先搜索。 贴上题目最好啦 好，我把题干打上来：
A marketing firm determined that, of 200 households surveryed,80 used neither Brand A nor Band 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.
A. 15
B. 20
C.30
D.40
E. 45
里面and for every household that usd both brands of soap,3 used only Brand B soap. 3 used only Brand B soap的解释是three times as many households use Brand B exclusively as use both brands. 这是什么表述方法？在其他题里面还有没有出现过类似的表达方式？如果有的话能不能把具体在个地方和题号发给我？谢谢了！
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