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ZX-DECBC44EFD2025年9月美国A卷 · 第 8 题
2025年9月美国A卷 · 原库模块 1 · Q8 原库参考解析
During hibernation, American black bears do not eat or replenish calories. A certain black bear weighed 515 pounds when entering hibernation and lost weight at a rate of 0.5 pound per day. At this rate, how many days after entering hibernation did the black bear weigh 490 pounds?
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