Change 9 cups to quarts: This unit fraction changes cups to pints. 9 c 1 9 qt 4 Larry needs 2 1 4 qt heavy cream for the cheese fondue. Check the answer by working backward. Change quarts to cups, then divide by 12. 2 1 4 qt 9 4 qt Change the mixed number to a fraction. 9 4 qt 2 pt 1 qt 2 c 1 pt Divide out the correct factors and units. 9 c This 9 c heavy cream is for 12 batches of cheese fondue. Divide 9 by 12 to determine how many cups of heavy cream are used for one batch. 9 c 12 This is the same as the amount stated in the original problem, so the answer is correct. YOU TRY 7 Julia’s frozen lemonade recipe uses 1 pt 2 c 9 12 2 3 1 qt 2 pt Divide out the correct units. This unit fraction changes pints to quarts. 9 4 qt 2 1 4 qt c 3 4 c heavy cream c lemon juice. If she needs to make 6 times the amount of the recipe, how many quarts of lemon juice will she need? Kate has to buy paprika at the grocery store. The label on the shelf for Brand A says that its unit cost is $1.79/oz. The label for Brand B says that the unit cost is $22.59/lb. Which is the better buy? Solution The units on each unit cost must be the same in order to compare them. Therefore, we will change ounces to pounds in the unit cost of Brand A. Unit cost of Brand A in dollars/lb: $1.79 oz 16 oz 1 lb $28.64 lb $28.64/lb The unit cost of Brand B is $22.59/lb. Brand B is the better buy because it has the lower unit cost. Check the answer by working backward. The check is left to the student. EXAMPLE 8 574 CHAPTER 7 Measurement and Conversion www.mhhe.com/messersmith
messersmith_power_prealgebra_1e_ch4_7_10
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