1. A chemist wants to create 100 grams of an aluminum alloy that is 55% pure. She has one mixture of an aluminum alloy that is 40% pure and another mixture that is 70% pure. How much of each mixture must she use? 50 grams at 40% pure and 50 grams at 70% pure 40 grams at 40% pure and 60 grams at 70% pure 30 grams at 40% pure and 70 grams at 70% pure
2. The Fluffy Lump Rescue League received a $5000 donation. They invested part of the money in a Money Market account at 6.2% and the rest in a Certificate of Deposit at 4.1%. After one year (simple interest) they earned $251.20. How much money was invested in each account? $3100 in the Money Market Account and $1900 in the CD $2200 in the Money Market Account and $2800 in the CD $2000 in the Money Market Account and $3000 in the CD
3. A biology student needs a mixture of 15% pure sodium. He has one jar of sodium that is 25% pure and another jar of sterile water that contains 0% pure sodium. How much 25% pure sodium needs to be mixed with 0% pure saline to create 100 liters of 15% pure sodium? 60 liters of 25% pure sodium and 40 liters of pure water 50 liters of 25% pure sodium and 50 liters of pure water 40 liters of 25% pure sodium and 60 liters of pure water
Copyright © 2000 Donna Tupper.
