How many ounces of a 7 acid solution and how many ounces of

How many ounces of a 7% acid solution and how many ounces of a 23% acid solution must be mixed to obtain 20 oz of a 17% acid solution?

x ounces of 7% acid solution

y ounces of 23% acid solution

x + y = 20

7% of x + 23% of y = 17% of 20

0.07*x + 0.23y = 0.17*20 = 3.4

Solving both equations:

x = 7.5 ounce

y = 12.5 ounce