Etch clean graphics uses on cleanser that is 25% acid and a 2ND that is 50% acid. How many liters of each should be mixed to get 30L of a solution that is 40% acid?

Answer 1

amount of the 25% used --- x L
amount of the 50% used --- 30-x L

.25x + .5(30-x) = .4(30)
25x + 50(30-x) = 40(30) ----> (don't like decimals)

solve for x

Answer 2

x is 10 is that the answer and will you explain how you set up the equation