Nadine mixes a juice solution that is made from 3 gallons of an 80% juice solution and 1 gallon of a 20% juice solution. What is the percent concentration of the final solution?

The 3 gallons of 80% solution contain 3 × 0.80 = 2.4 gallons of juice, and the 1 gallon of 20% solution contains 1 × 0.20 = 0.2 gallons. Together, that is 2.6 gallons of juice in 4 gallons of solution, so 2.6 ÷ 4 = 0.65, or 65%. The correct choice is 65%.

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