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读五年级的女儿今天又问了我一道奥数题，还好我会讲。
饲养场的白兔只数是黑兔的5倍，后来卖掉了10只黑兔，买回来20只白兔，现在白兔的只数是黑兔的7倍。饲养场原来养白兔和黑兔各多少只？
五年级奥数（上册）共15个问题33/89
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