How much of the 10% solution will he need to use

Question

he needs to make 60 liters of a 36% acid solution to test a new product. His supplier only ships a 10% and 40% solution. he decides to make the 36% solution by mixing the 10% solution with the 40% solution

Answer 1

0.36(60) = 21.6 liters of acid

t + f = 60

0.1t + 0.4f = 21.6

t = 60 - f

0.1(60 - f) + 0.4f = 21.6

6 - 0.1f + 0.4f = 21.6

0.3f = 15.6

f = 52 liters

t = 60 - 52

t = 8 liters