A pharmacist has a 45% acid solution and a 35% acid solution. How many liters of each must be mixed to form 80 liters of a 40% acid solution?

Question

How do I solve this problem?

Answer 1

Set it up this way:

 

x = liters of 45% acid

80 - x = liters of 35% acid

 

45x + 35(80- x)= 40(80)

 

Solve for x and get 80 - x.