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ZX-75736EDAC62026年6月国际A卷 · 第 6 题
2026年6月国际A卷 · 原库模块 2 · Q6 参考答案
A machine makes 4-inch, 7-inch, and 9-inch parts. During a certain day, the number of 4-inch parts that the machine makes is 5 times the number n of 7-inch parts, and the number of 9-inch parts is 4. During this day, the machine makes 100 parts total. Which equation represents this situation?
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