Two ounces.
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10 percent of 12 ounces is 1.2 ounces.
How much of an alloy that is 10% copper should be mixed with 400 ounces of an alloy that is 70% copper in order to get an alloy that is 20%
To find 20 percent of a value, multiply it by 0.2. In this instance, 128 x 0.2 = 25.6. Therefore, 20 percent of 128 ounces is equal to 25.6 ounces.
To find 20 percent of a value, multiply that value by 0.2. In this instance, 0.2 x 8 = 1.6. Therefore, 20 percent of 8 ounces is equal to 1.6 ounces.
12.8 ounces.