How many liters of a 20 alcohol solution must be mixed with

How many liters of a 20% alcohol solution must be mixed with 40 liters of a 80% solution to get 70% solution? Objective: (1.2) Solve Apps: Mixtures

Solution

Assume the volume in liter = v

balance the amount of alchohol in the solution

v*0.2 + 40*0.8 = v*0.7

v/5 +32 =7v/10

7v/10-v/5 = 32

5v/10 = 32

v = 32*2

v = 64 L