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 15 percent alcohol by volume?	Answers
A) 50  B) 100  C) 150  D) 200  E) 250
15% is 5%-points higher than 10% but 15%-points lower than 30%.   Thus there should be 3 parts of solution X for 1 part of solution Y.   We should add 100 ml of solution Y.   The answer is 100.
<result>B</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 15 percent alcohol by volume?