1. Precal D Section 1.4 Sample Problems

2. Example 1 - Investments A total of $12,000 is invested in a savings and a checking account. The savings account has 2.5 times as much money as the checking account. How much money is in each account?

3. Example 2 - Interest Juan invested $20,000 in two accounts. One earns 8% interest while the other earns 11% interest. How much should be invested in each if Juan earns $1,900 in annual interest.

4. Example 3 - Mixtures Sam is mixing cashews and peanuts. The cashews cost $3.29 per pound and the peanuts cost $1.28 per pound. How much of each should be used to make a 50 pound mixture worth $1.99 per pound?

5. Example 4 - Chemistry How much of a 60% acid solution should be mixed with a 40% acid solution to make 100 ml of a 48% acid solution?

6. Example 5 - Motion A speed boat can travel upstream from Welkerville to Cedarville and return in 4 hours. The distance between the two towns is 32 miles. If the speed of the current is 4 mph, what is the speed of the boat.

7. Example 6 - Work Peter can paint the room in 8 hours. Joan can paint the room in 6 hours. How long will it take to paint the room working together?