题目：
A 5-liter jug contains 4 liters of a saltwater solution that is 15 percent salt. If 1.5 liters of the solution spills out of the jug, and the jug is then filled to capacity with water, approximately what percent of the resulting solution in the jug is salt ？（）
A.A
B.B
C.C
D.D
E.E
答案：
参考答案：A
解析：
设最后罐子中的盐溶液的浓度为x，则根据题意可得
。
