Dan wants to determine the number of liters of a 20% acid cleaning solution that he should combine with an 80% acid cleaning solution to create 50 liters of a 60% acid cleaning solution.

Part A

Let z represent the number of liters of the 20% acid cleaning solution. Which equation represents this situation?

0.6(50) = 0.22 +0.87

0.23 +0.8(50 - 2) = 0.6(50)

0.6(50) = 0.2x + 0.8(x - 50)

0.22 + 0.8(2 + 50) = 0.6(50)

Part B

How many liters of the 20% acid cleaning solution should Dan use? Round your answer to the nearest tenth of a liter.

Dan should use

liters of the 20% acid cleaning solution