A 20% acid solution is Ro be mixed with 50% acid solution I. Order to get 600 ounces of a 30% acid solution. How many ounces of 20% solution and 50% solution should be mixed?

Solution:

20% solution:x

50% solution: 600-x

So

20%*x+50%(600-x)= 30%*600

x = 400

So

20% solution:400

50% solution: 200