Question

In the lab, Maria has two solutions that contain alcohol and is mixing them with each other. She uses

3
times as much Solution A as Solution B. Solution A is
17%
alcohol and Solution B is
20%
alcohol. How many milliliters of Solution B does she use, if the resulting mixture has
213
milliliters of pure alcohol?

Answer 1

the answer is 53.35 ml of solution B

Working - there are 4 parts in total (1 part solution B and 3 parts solution A)

therefore 213 divide 4 = 53.24 ml

Check - 53.25 x 1 = 53.25

and 53.25 x 3 = 159.75

Add 53.25 and 159.75 = 213