Maria needs to mix a 10% saline solution with a 60% saline solution to create 200 millileters of a 20% solution.

Question

Maria needs to mix a 10% saline solution with a 60% saline solution to create 200 millileters of a 20% solution. How many millileters of each solution must Maria use?

Answer: Maria must mix

 ________ millileters of 10% solution and

________ millileters of 60% solution.

Answer 1

convert percentages to decimal (divide by 100).

x = ml of 0.1 solution

200-x = ml of 0.6 solution

total 200 ml of 0.2 solution

x * 0.1 + (200 - x) * 0.6 = 200 * 0.2

solve for x to get ml of 0.1 solution

subtract from 200 to get ml of 0.6 solution.