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四年级奥数 两库原有米320吨 甲运出40吨乙运进20吨后甲是乙的2倍
四年级奥数和倍问题:甲乙两库原有大米320吨，从甲库运出40吨，乙库运进20吨，这时甲库大米是乙库的2倍，求甲乙两库原有大米数
四年级数学培优4/10
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四年级奥数和倍问题:甲乙两库原有大米320吨，从甲库运出40吨，乙库运进20吨，这时甲库大米是乙库的2倍，求甲乙两库原有大米数
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