ba cửa hàng bán được 2870 lít dầu . Cửa hàng thứ nhất bán được gấp đôi cửa hàng thứ 2 . Cửa hàng thứ 3 bán bằng 1/4 cửa hàng thứ nhất . Hỏi mỗi cửa hàng bán được bao nhiêu lít dầu hỏa ?

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