AMC 8 2015 Problem 20
AMC8 2015 年第 20 题
特殊数与不定方程★★★☆☆
Ralph went to the store and bought 12 pairs of socks for a total of $24. Some of the socks he bought cost $1 a pair, some of the socks he bought cost $3 a pair, and some of the socks he bought cost $4 a pair. If he bought at least one pair of each type, how many pairs of $1 socks did Ralph buy?
去商店买了 12 双袜子，总共花了 24 美元。在她买的这些袜子中，有的是 1 美元一双，有的是 3 美元一双，还有的是 4 美元一双。如果她每种袜子都至少买了 1 双，那么 1 美元一双的袜子她买了多少双？
- A.4
- B.5
- C.6
- D.7
- E.8
正确答案 · Correct Answer
D
解析 · Solution
解析整理中
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