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 25% vinegar, dressing P comprises what percentage of the new dressing? Choose the most appropriate option
A) 75%
B) 60%
C) 40%
D) 25%
E) 20%
Let x be the percentage of dressing P in the new dressing.   0.3x + 0.1(1-x) = 0.25   0.2x = 0.15   x = 0.75 = 75%   The answer is 75%.
<result>A</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 25% vinegar, dressing P comprises what percentage of the new dressing?