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 18% vinegar, dressing P comprises what percentage of the new dressing?	Choose the correct choice from the following options:	A) 20%	B) 30%	C) 40%	D) 50%	E) 60%
Let x be the percentage of dressing P in the new dressing.   0.3x + 0.1(1-x) = 0.18   0.2x = 0.08   x = 0.4 = 40%   The answer is 40%.
<result>C</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 18% vinegar, dressing P comprises what percentage of the new dressing?