Re: [計量] The daily rate for a hotel room ...
※ 引述《GrantHill33 (葛蘭特希爾)》之銘言:
: 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 foe 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
: 答案是(C)
: 但實在不了解
題目條件:1人住付39元,若有2人以上同行的話,1個人付39元,其他人付x元。
現在有3個人入住,每人平均分21元。
問題:x是多少元?
解法:有三人入住,一共付39+2x元,但由平均每人付21元,可得39+2x=21*3
故x=12
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10/20 16:17, , 1F
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※ 編輯: dragonegg 來自: 118.166.194.57 (10/20 16:23)
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