12 oz. x 0.09 = 1.08 oz = 1.1 oz (2 sig. figs.)
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9/12 x 100 = 75 percent.
It is: 9/12 = 75%
Let a be the number of ounces of 25% alcohol required. Then, 25a + (30x9) = 28(9 + a) 25a + 270 = 252 + 28a 3a = 18 a = 6 Then 6 ounces of 25% alcohol + 9 ounces of 30% alcohol produces 15 ounces of 28% alcohol.
9 pounds and 10 ounces + 2 pounds and 12 ounces =12 pounds and 6 ounces9 pounds and 10 ounces2 pounds and 12 ounces===============11pounds and 22 ouncesbut1 pound = 16 ouncesthus 22 ounces = 1 pound and 6 ounces11 pounds and 22 ounces:= 11 pounds + (1 pound + 6 ounces)= 12 pounds + 6 ounces
It is: 9/12 times 100 = 75%