Posted by **Tj** on Thursday, October 28, 2010 at 6:46pm.

A chef is using a mixture of two brands of Italian dressing. The first brand contains 7% vinegar, and the second brand contains 11% vinegar. The chef wants to make 280 milliliters of a dressing that is 10% vinegar. How much of each brand should she use?

first brand?

second brand?

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