a. You want to mix a 10 % orange juice drink with 100 % pure orange juice to make a 40 % orange juice drink. The function y=(2)(1.0)+x(0.1) / 2+x gives the concentration y of orange juice in the drink after you add x gallons of the 10% drink to 2 gallons of pure juice. How much of the 10 % drink must you add to get a drink that is 40 % juice?