题目内容：

英语翻译
【If 2 percent of a 12-gallon solution is sodium,how many gallons of pure sodium must be added to make a new solution that is 6 percent sodium?】
请翻译上面【】裏面的内容,

优质解答

如果12加仑溶液里有2%是纳,那么要加多少加仑纯钠下去才可将该溶液变为含钠6%的溶液?