oz and solutions

Question

How many ounces of 100% acid solution should be combined with a 4% acid solution to obtain 480 ounces of an 8% acid solution?

Answer 1

1.00x + .04(480-x) = .08(480)= 38.4

.96x = 38.4 - 19.2 = 19.2

x = 19.2/.96 = about 20.4 ounces of pure 100% acid solution

480-20.4 = 459.6 ounces of 4% acid solution

mixed to get 480 ounces of 8% acid solution

100 is within 92 of 8

4 is within 4 of 8

92/4 = 23

459.6/20.4 = close to 23