A restaurant has one type of lemonade that is 12% sugar and another that is 7% sugar. How many gallons of each type does that restaurant need to make 20 gallons of a lemonade mixture that is 10% sugar? A.12 gallons of the 12% lemonade and 8 gallons of the 7% lemonade. B. 10 gallons of the 12% lemonade and 10 gallons of the 7% lemonade. C. 8 gallons of the 12% lemonade and 12 gallons of the 7% lemonade. D. 2 gallons of the 12% lemonade and 18 gallons of the 7% lemonade.