Question

a chemist needs to prepare 28 ounces of a 8% hydrochloric acid solution. find the amount of 14% solution and the amount of 7% solution he should mix to get this solution.

Answer 1

amount of 14% solution --- x
amount of 6% solution ----- 28-x

solve for x:

.14x + .07(28-x) = .08(28)

I suggest multiplying each term by 100 to get rid of those pesky decimals