A certain prosthodontist specializes in implanting gold and silver teeth in his patients’ mouths. He charges $650 for a gold too

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问题 A certain prosthodontist specializes in implanting gold and silver teeth in his patients’ mouths. He charges $650 for a gold tooth and $325 for a silver tooth. If his total fees for implanting gold and silver teeth last week were $15,925 in total, and he implanted five more gold teeth than silver teeth, how many teeth in total did he implant over the week?

选项 A、31
B、32
C、33
D、34
E、35

答案A

解析 It is probably easiest to approach this question by plugging in the available answers and seeing which one works. If it was 31 teeth (answer A), for example, then we know that the doctor implanted 18 gold and 13 silver. 18×$650+13×$325=$15,925, so A is the answer.

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A certain prosthodontist specializes in implanting gold and silver teeth in his patients’ mouths. He charges $650 for a gold too

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