Jerry is experimenting with chemicals in the laboratory. He mixes a solution that is 10% acid with a solution that is 30% acid. How much of the 30% acid solution will be needed to make 40 liters of solution that is 25% acid?

Question

anonymous · Answer

Let's start with an equation.  $$0.10x+0.30(40-x)=0.25*40$$  Or $$10x+30*40-30x=25*40$$  

$$-20x=-5*40$$
x=10 liters (amount of 10% solution required)

40-x=30 liters (amount of 30% solution required)

You need 30 liters of 30% solution

anonymous · Answer

thank you mossyfish