How many gallons of water must be mixed wi
题型：单项选择题
问题：
How many gallons of water must be mixed with 1 gallon of a 15-percent salt solution to obtain a 10-percent salt solution ？（）
A．0.50
B．0.67
C．1.00
D．1.50
E．2.00
How many gallons of water must be mixed with 1 gallon of a 15-percent salt solution to obtain a 10-percent salt solution ？（）
A．0.50
B．0.67
C．1.00
D．1.50
E．2.00