[計量] 請教一題計量問題
各位好:
想請教一題計量，題目實在是看不懂
怎麼會3個人平均付的錢比四個人平均付的錢還少?
The daily rate for a hotel room that sleeps 4 people is $39 for one person
and X dollars 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
請版友幫忙解答 謝謝
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