A Mixture of 9% Disinfectant Solution Is to Be Made

Multiple Choice

A mixture of 9% disinfectant solution is to be made from 15% and 8% disinfectant solutions. How much of each solution should be used if 70 gallons of 9% solution are needed?

A) 10 gallons at 15% solution, 60 gallons at 8% solution
B) 58 gallons at 15% solution, 12 gallons at 8% solution
C) 5 gallons at 15% solution, 65 gallons at 8% solution
D) 12 gallons at 15% solution, 58 gallons at 8% solution
E) 20 gallons at 15% solution, 50 gallons at 8% solution