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题目内容双击单词支持查询和收藏哦～
At first, water accounts for $$\frac{2}{5}$$ of a barrel. Later, 40 gallons of water is removed from the barrel, then the water left only accounts for $$\frac{2}{11}$$ of the barrel. Therefore, how many gallons of water is still needed to fill the barrel?
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以上解析由 考满分老师提供。
