Question 23 How much of 20% lidocaine and 30% lidocaine are needed to make 500 mL of a 28% concentration? Group of answer choices 50 mL of 20%; 450 mL of 30% 100 mL of 20%; 400 mL of 30% 400 mL of 20%; 100 mL of 30% 450 mL of 20%; 50 mL of 30% Question 24 Dextrose 40%, 1000 mL is prescribed. The pharmacy only stocks 20% and 50% solutions. How much of each is needed to make the desired solution? Group of answer choices 250 mL of 20%; 750 mL of 50% 333 mL of 20%; 667 mL of 50% 667 mL of 20%; 333 mL of 50% 750 mL of 20%; 250 mL of 50% Question 25 A physician ordered potassium chloride 20%, 500 ml. The pharmacy stocks only 40% and 10% potassium chloride. How much of each is needed to make this solution? Group of answer choices 100 mL of 10%; 400 mL of 40% 167 mL of 10%; 333 mL of 40% 333 mL of 10%; 167 mL of 40% 400 mL of 10%; 100 mL of 40%