Solution X is 10 percent alcohol by volume, and solution Y is 30 percent alcohol by volume. How many milliliters of solution Y must be added to 300 milliliters of solution X to create a solution that is 18 percent alcohol by volume?  Choose the correct choice from the following answers:
A) 100 B) 150 C) 200 D) 250 E) 300
18% is 8%-points higher than 10% but 12%-points lower than 30%.   Thus there should be 3 parts of solution X for 2 parts of solution Y.   We should add 200 ml of solution Y.   The answer is 200.
<result>C</result>
Solution X is 10 percent alcohol by volume, and solution Y is 30 percent alcohol by volume. How many milliliters of solution Y must be added to 300 milliliters of solution X to create a solution that is 18 percent alcohol by volume?