[計量] pp2-ds-72
72. Of the 4,800 voters who voted for or against Resolution K, 1800 were
Democrats and 3,000 were Republicans. What was the total number of female
voters who voted for Resolution K ?
(1)3/4 of the Democrats and 2/3 of the Republicans voted for Resolution K.
(2) 1/3 of the Democrats who voted for Resolution K and 1/2 of the Republicans
who voted for Resolution K were females.
ans: C
我不懂的地方是第二個選項， 第二個選項不是說 1/3的 Democrats 是投給 Resolution K
是女性 且1/2 of the Republican 投給Resolution K 也是女性
那不就是答案要的 總共有多少人投給 Resolution K 是女性 呢
18000*1/3 +3000*1/2 = 不就是答案嗎?
不知道翻的是不是有問題了 還是意思搞 錯了 麻煩大家幫我看一下 感激不盡~> <
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想問另一個簡單的問題
求連續11個整數的平均值。套用平均值的公式可得知: (K+(K+10))/2
我對上面的公式有點疑惑 耶(是解答上寫的)
因為不是應該還要乘以 11嗎? 也就是應該是 (K+(K+10))*11/2 不知道我這樣對嗎?!
麻煩大家告訴我哪一個才是對的 謝謝 > <
※ 編輯: popolin29 來自: 122.120.160.87 (12/05 08:38)
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