Salad dressing P is made up of 30% vinegar and 70% oil, and salad dressing Q contains 10% vinegar and 90% oil. If the two dressings are combined to produce a salad dressing that is 20% vinegar, dressing P comprises what percentage of the new dressing?  Select the correct option
A) 60% B) 50% C) 40% D) 30% E) 20%
Let x be the percentage of dressing P in the new dressing.   0.3x + 0.1(1-x) = 0.20   0.2x = 0.10   x = 0.5 = 50%   The answer is 50%.
<result>B</result>
Salad dressing P is made up of 30% vinegar and 70% oil, and salad dressing Q contains 10% vinegar and 90% oil. If the two dressings are combined to produce a salad dressing that is 20% vinegar, dressing P comprises what percentage of the new dressing?