Question

How many liters each of a 25% acid solution and a 50% acid solution must be used to produce 80 liters of a 40% acid solution?

Answer 1

• 32 and 48 liters

Explanation:

Let 25% solution is x liters, then 50% solution is (80 - x) liters.

Acid content is going to be same:

• 0.25x + 0.5(80 - x) = 80*0.4
• 0.25x - 0.5x + 40 = 32
• 0.25x = 8
• x = 8/0.25
• x = 32 liters

So 32 liters of 25% solution and 80 - 32 = 48 liters of 50% solution