Chemistry Solution Math Problem - HELP!

Question

A chemist needs 80 milliliters of a 50% solution but she only has 20% and 60% solutions available. Calculate how many milliliters of each should be mixed to get the desired result. How many milliliters of the 20% solution should she use?

Answer 1

(x ml)(20%) + (80-x ml)(60%) = (80ml)(50%)

Solve for x to get mls of 20%. Then find mls of 60% by subtracting that value from 80 mls