Mix a solution that is 70% alcohol with a solution that is 10% alcohol to make 240 mL of a solution that is 20% alcohol. How much of each solution should you use?

Question

A. So, mix 120 mL of the 70% solution and 120 mL of the 10% solution.
B. So, mix 30 mL of the 70% solution and 210 mL of the 10% solution.
C. So, mix 40 mL of the 70% solution and 200 mL of the 10% solution.
D. So, mix 210 mL of the 70% solution and 30 mL of the 10% solution.
E. So, mix 200 mL of the 70% solution and 40 mL of the 10% solution.

Answer 1

Answer: C