A chemist mixes one liter of pure water with x liters of a 50% salt solution, and the resulting mixture is a 15% salt solution. What is the value of x? Pick one:
A) 1/4	B) 1/3	C) 1/2	D) 1	E) 3/7
Concentration of salt in pure solution = 0   Concentration of salt in salt solution = 50%   Concentration of salt in the mixed solution = 15%   The pure solution and the salt solution is mixed in the ratio of --&gt; (50 - 15)/(15 - 0) = 7/3   1/x = 7/3   x = 3/7   Answer: 3/7
<result>E</result>
A chemist mixes one liter of pure water with x liters of a 50% salt solution, and the resulting mixture is a 15% salt solution. What is the value of x?