Answer:
We have 10 liters of 30% acid
We want to add "x" liters of 20% acid to make a 25% acid solution.
.30 * 10 + .20x = .25 * (10 +x)
3 + .20x = 2.5 + .25x
.5 = .05 x
x = 10 liters
CHECKING THE CALCULATIONS:
10 liters of 30% acid + 10 liters of 20% acid =
20 liters of 25% acid
Step-by-step explanation:
