A Biologist Has a 40% Solution and a 10% Solution

Multiple Choice

A biologist has a 40% solution and a 10% solution of the same plant nutrient. How many cubic centimeters of each solution should be mixed to obtain 40 cc of a 25% solution? ​

A) The biologist should mix 15 cc of 40% solution with 25 cc of 10% solution.
B) The biologist should mix 20 cc of 40% solution with 20 cc of 10% solution.
C) The biologist should mix 5 cc of 40% solution with 35 cc of 10% solution.
D) The biologist should mix 25 cc of 40% solution with 15 cc of 10% solution.
E) The biologist should mix 30 cc of 40% solution with 10 cc of 10% solution.