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ZX-0C13C8A8FD2025年6月国际B卷 · 第 12 题
2025年6月国际B卷 · 原库模块 2 · Q12 原库参考解析
A machine makes 8-inch, 5-inch, and 7- inch parts. During a certain day, the number of 8-inch parts that the machine makes is 3 times the number n of 5-inch parts, and the number of 7-inch parts is 12. During this day, the machine makes 100 parts total. Which equation represents this situation?
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