Answer:
100 liters
Step-by-step explanation:
Fill in the desired concentration and solve for x.
[tex]0.40=\dfrac{x+0.3\cdot 600}{x+600}\\\\0.4(x+600)=x+0.3(600)\\\\(0.4-0.3)(600)=(1-0.4)x\\\\x=\dfrac{0.1(600)}{0.6}=100[/tex]
100 liters of pure peroxide should be added to produce the desired product.