SOLUTION: A chef is using a mixture of two brands of Italian dressing. The first brand contains 6% vinegar, and the second brand contains 11% vinegar. The chef wants to make 390 milliliters

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Question 975110: A chef is using a mixture of two brands of Italian dressing. The first brand contains 6% vinegar, and the second brand contains 11% vinegar. The chef wants to make 390 milliliters of a dressing that is 7% vinegar. How much of each brand should she use?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Vinager%2FDressing=7%2F100

Let v be how many milliliters of 6% vinegar. This means 390-v is how much 11% vinegar.

%286v%2B11%28390-v%29%29%2F390=7