Question

A 20% acid solution is mixed with a 70% acid solution to get 50 liters of a 40% solution. How much of the 70% solution is used?

Answer 1

20% solution+70% solution=50% solutiontotal is 50so the quantaties are x and 50-x (x+50-x=50)0.2(50-x)+0.7(x)=0.4(50)solve
distribute10-0.2x+0.7x=2010+0.5x=20minus 10 both sides0.5x=10times 2 x=20

The answer is 20