Vada, a pharmacy technician, has a 30% glucose solution. She adds 20 mL to a total of 600 mL. Which expression should Vada use to check the concentration of the final solution? O CF x 20 ml = 30% x 600 mL O CF =30% x 600 ml/20mL 30% x 20 mL = CF x 600 mL CFX 30% = 600 mL x 20 mL​