A scientist needs 10 liters of a 20% acid solution for an experiment, but she has only a 5% solution and a 40% solution. To the nearest tenth of a liter, about how many liters of the 5% and the 40% solutions should she mix to get the solution she needs?
+37159 10 liters total x = 5% 10-x = 40%
amount of ingredients = final amount
.05 x + .40(10-x) = .20 (10)
solve for 'x' the amount of 5% then 10-x = 40% amount
