Re: [計量] 請教一題數學
※ 引述《supersoda (汽水哥哥)》之銘言：
: If 55 percent of a group of people have brown hair and 80 percent
: of the same group do not have red hair, what fraction of those who
: do not have brown hair have red hair?
: ans:4/9
: 不知道是我看不懂題目還是答案有錯
: 我怎麼看感覺答案都是5/9
: (選項有 1/4 4/11 4/9 5/9 4/5)
Ans= (red hair)/(not brown hair) = 20/(100-55) = 20/45 = 4/9
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