talaangoshtari wrote:
Since the 12-ounce vineger-and-oil-mixture is 40% vinegar, the amount of vinegar = (40/100)(12) = 4.8 ounces.
Since the resulting mixture must be 25% vinegar, these 4.8 ounces of vinegar must constitute 25% of the resulting mixture:
(4.8) = (25/100)x
4.8 = (1/4)x
19.2 = x.
Since the total volume increases from 12 ounces to 19.2 ounces, the amount of added oil = (new volume) - (old volume) = 19.2 - 12 =
7.2 ounces.
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