[計量] OG 11版 第6題~

[lazyer (爆笑劇)]

問橘本計量~ 題目英文有不懂地方~ 11版 3.1-6, 頁48~

6.
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 houshold
                                                        ^^^^^
   請問for在這此是代表以used both brands of soap 為基準的意思嘛??太微妙了~
因為解答設both 有A有B為X ,只有B為3X

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  答案A

這題會算..只是對計量的英文有點不適應:P 請大家回應一下 我這樣解釋是正確的嘛:P
問簡單的不要笑我= =

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推 metamorphic:OG橘本前面的題目難度都不錯 這題我也是被句意搞死= =