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牧场准备过冬的干草，刚好够100只羊、50头牛和20匹马过冬
【2017上海-80】牧场准备过冬的干草，刚好够100只羊、50头牛和20匹马过冬，已知一匹马的食量是一只羊的四倍，而一头牛的食量是一匹马和两只羊食量的总和。根据牧场储备的干草总量，如果只养牛的话，可以养( )头。 A.60 B.70 C.80 D.90
公务员考试数量关系刷题组24/53
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