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.