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ZX-A7E1F1C29C2025年8月国际B卷(易) · 第 1 题
2025年8月国际B卷(易) · 原库模块 1 · Q1 原库参考解析
The equation \( x+y=1,440 \) represents the number of minutes of daylight (between sunrise and sunset), x, and the number of minutes of non-daylight, y, on a particular day in Des Moines, Iowa. If this day has 840 minutes of daylight, how many minutes of non-daylight does it have?
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