[計量] 老方模考題

看板GRE (GRE入學考試)作者 (涼爽的天氣 悠閒的心情)時間16年前 (2010/01/22 23:03), 編輯推噓3(304)
留言7則, 5人參與, 最新討論串1/2 (看更多)
The daily rate for a hotel room that sleeps 4 people is $39 for one person and x dollar for each additional person. If 3 people take the room for one day and each pays $21 for the room, what is the value of x? (A)6 (B)8 (C)12 (D)13 (E)24 Ans: C 有沒有哪位大大可以告訴我,"C"是怎麼得到的 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.166.220.56

01/22 23:15, , 1F
(39+2X)/3=21 Solve X then get 12
01/22 23:15, 1F

01/22 23:34, , 2F
why? could you explain that? thanks
01/22 23:34, 2F

01/22 23:49, , 3F
只住一個人總價39 每多一個人加x元 三個人總價是
01/22 23:49, 3F

01/22 23:51, , 4F
39+2x 所以每個人如果出21的話就是 (39+2X)/3=21
01/22 23:51, 4F

01/23 00:30, , 5F
總覺得題目怪怪的4 people not 1 person 39...XD
01/23 00:30, 5F

01/25 16:13, , 6F
沒錯~這就是我一直誤會的地方
01/25 16:13, 6F

01/25 22:56, , 7F
誤會的點應該是四人房卻分開算錢XD
01/25 22:56, 7F
文章代碼(AID): #1BMRvTBM (GRE)
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文章代碼(AID): #1BMRvTBM (GRE)