How many ounces?

Question

Doreen Schmidt is a chemist. She needs to prepare 36 ounces of a 17​% hydrochloric acid solution. Find the amount of 18​% solution and the amount of 9​% solution she should mix to get this solution.How many ounces

of the 18​% acid solution should be in the​ mixture?

Answer 1

a + b = 36 -----> b = 36 - a

0.18a + 0.09b = 0.17(36)

Substitute!

0.18a + 0.09(36 - a) = 0.17(36)

0.18a + 3.24 - 0.09a = 6.12

0.09a = 2.88

a = 32 oz