
Francisco P. answered 11/14/14
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18% of 3 quarts make 0.54 quarts. If you mix 2 quarts of pure antifreeze with this solution, you will get a total of 0.54 + 2 = 2.54 quarts of antifreeze in a total volume of 3 + 2 = 5 quarts.
The final percentage of antifreeze would be the amount of antifreeze by volume divided by the total volume:
2.54/5 x 100% = 50.8% antifreeze solution.