### Conquering Mixture Problems — Answers

**Answers to Mixture Problems**

In my last post I provided three mixture problems for all of you to do.

Here again are the problems, with the answers to them italicized.

1. Kendra starts with 10 liters of a 40% antifreeze solution. How many liters of pure antifreeze would she need to add to end up with a solution that is 60% antifreeze?

**Kendra would need to add 5 liters of pure antifreeze.**

2. Keith the chemist has a solution that is 25 quarts of 20% Boric Acid. How many quarts of 70% Boric Acid would Keith need to add to end up with a solution that is 50% Boric Acid?

**Keith would need to add 37.5 quarts of 70% Boric Acid.**

3. Erin has a 2-liter solution that is 15% alcohol. How much pure alcohol would she need to add to it to end up with a solution that is 40% alcohol?

**Erin would need to add 5/6 of a quart.**