A solution is made by mixing 10 fl oz of oil and 70 fl oz of gas. What is the percent concentration of oil in the mixture?

So 10 oz oil + 70 oz of gas = 80 oz total in solution.

Percentage of oil is 10/80 = 1/8 = 0.125 or 12.5%, 13% if you round up to the nearest percentage point.

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