Question

A chemist is mixing a 50% salt solution with an 18% salt solution to make 40 L of a new solution that will contain 30% salt. How much of each of the original solutions should the chemist use?

Answer 1

See below

Explanation:

Sum of ingredients = sum of final solution

.50 x where x = 50 percent amount then 40 - x = 18% amount

.50 x + .18(40 - x) = .30 ( 40 )

.50 x + 7.2 - .18x = 12

.32x = 4.8

x = 15 L of 50% 25 liters of 18%