Question

Terrence, a chemist at a chemical supply company, has carefully measured out 400 litres of a solution containing 5% acetone. He also has access to unlimited quantities of a 20% acetone solution. How many litres of the 20% acetone solution must Terrence add to the 5% acetone solution to create a solution that contains 14% acetone?

Answer 1

.20x + .05(400) = .14(x+400)