Question

In the lab, Milan has two solutions that contain alcohol and is mixing them with each other. Solution A is 40% alcohol and Solution B is 10% alcohol. He uses 400 milliliters of Solution A. How many milliliters of Solution B does he use, if the resulting mixture is a 30% alcohol solution?

Answer 1

Answer: 80 mL

Explanation:

Add all percents together= 80%

Leftover= 20%
20% of 400 is 80.