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胖博士奥数课堂699期：20200213（五年级）比例问题视频讲解
已知三种混合物由三种成分A、B、C组成，第一种仅含成分A和B，重量比为3:5；第二种只含成分B和C，重量比为1:2；第三种只含成分A和C重量之比为2:3。以什么比例取这些混合物，才能使所得的混合物中A、B和C这三种成分的重量比为3:5:2?
胖博士奥数课堂34/274
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