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小学离校考试学习指南/数学
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来自维基教科书，开放世界，开放书籍
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小学离校考试学习指南
示例问题
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编辑源代码
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鱼缸中 80% 的鱼是孔雀鱼，其余为莫莉鱼。27 条孔雀鱼和 12 条莫莉鱼离开鱼缸后，鱼缸中 75% 的鱼是孔雀鱼。开始时鱼缸中共有多少条鱼？
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书籍：小学离校考试学习指南
华夏公益教科书
