Practice Run

Susan found a bag of 20 golf balls at a garage sale, and bought the bag for 75 cents. Express the ratio of cost to number of balls in lowest terms.

A statckable CD rack holds 25 CDs and costs $4. Charlie has a collection of 150 CDs. How much will it cost him to buy enough racks to hold all of his CDs?

A gardening magazine suggested that a good mix for a flower bed is 20 pails of clay dirt, 15 pails of sand, and 5 pails of manure. Express this in lowest terms.

Solve the proportion.

You can peel 4 potatoes in 10 minutes. How long will it take you to peel 14 potatoes?