[問題] OG裡的問題
再OG裡有一題題目是
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?
由於解答裡寫的是僅用B的是AB都用的三倍?
請問這可以從哪裡看是三"倍"，而不是三個
謝謝
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 220.229.173.25
討論串 (同標題文章)
GMAT 近期熱門文章
PTT職涯區 即時熱門文章