cmal wrote:5. A mixture of 12 ounces of vinegar and oil is 40%n vinegar by weight. How many ounces of oil must be added to the mixtue to produce a new mixture that is only 25% vinegar?
answer?
I dont know the answer but I Came up with 20?
Pls help
Another approach:
40% of the original mixture is vinegar and 60% is oil:
Vinegar : Oil = 4:6 = 2:3.
If the amount of OIL doubles:
Vinegar :
Oil = 2:
6 = 1:
3.
The ratio above indicates that, of every 4 ounces, 1 ounce will be vinegar and 3 ounces will be oil, yielding a mixture that is 1/4 vinegar.
Thus, the amount of oil must double.
Since the amount of oil in the original mixture = .6(12) = 7.2 ounces, another 7.2 ounces of oil must be added.
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