Salad dressing A is made up of 30% vinegar and 70% oil, and salad dressing B contains 10% vinegar and 90% oil. If the 2 dressing are combined to produce a salad dressing that is 15% vinegar, dressing A comprises what % of the new dressing?
Options.
A) 15% B) 20% C) 25% D) 40% E) 55%
The total combination must be 100%. Let X% of dressing 1 is used.   30 * x + 10 * (100-x) = 15*100   solving, x= 25%   25% is the answer.
<result>C</result>
Salad dressing A is made up of 30% vinegar and 70% oil, and salad dressing B contains 10% vinegar and 90% oil. If the 2 dressing are combined to produce a salad dressing that is 15% vinegar, dressing A comprises what % of the new dressing?