76) Logan wants to buy the box of corn fl akes with the lower unit cost. The label on the shelf for Brand A says that its unit cost is $0.31/oz, and the unit cost of Brand B is $5.09/lb. Which brand should Logan buy? 77) When ladybugs fl y, they fl ap their wings approximately 85 times per second. How many times does a ladybug fl ap its wings during a 5-minute fl ight? (www.sandiegozoo.com) 78) The Sony Bravia XBR HX909 3D HDTV offers a screen size that measures 413 ft diagonally. How many inches is this? (www.sonystyle.com) 79) Joseph wants to line his garden with a fence that costs $2.25 per foot. Use the diagram below to calculate the total cost. 2.5 yd Garden area 6 yd 80) A high school wants to put a fence around its new football fi eld. The length of the area that will be enclosed is 138 yd, and the width is 72 yd. If the fence costs $8.40 per foot, fi nd the cost of the fence. 70) Susan is a restaurant manager and scheduled fi ve employees to work 7.5 hr on Friday. Find the total number of minutes the employees worked. 71) Mohsin purchased a 30-oz bag of dried Turkish fi gs for $11.40. What is the cost per pound? 72) Shufan bought an 8-oz jar of blackberry jam for $3.99. What is the cost per pound? 73) Roberto has to buy saltine crackers at the store. The label on the shelf for Brand A says that its unit cost is $3.19/lb. Brand B says that its unit cost is $0.18/oz. Which is the better buy? 74) Jung-Su is having a dinner party and wants to make enough cheesecake for everyone. If he makes eight cheesecakes and each one uses 3 4 c milk, how many quarts of milk should he buy? 75) Valerie compares two brands of jars of pickles. Brand A sells for $0.19/oz while Brand B sells for $2.99/lb. Which is the better buy? R1) Which process is easier to use: multiplication and division, or unit analysis? R2) Why do you never have to “divide” when using unit analysis? R3) Think of a situation where you needed to convert between U.S. customary units, and write an application problem similar to those you just solved. 444 CHAPTER 7 Measurement and Conversion www.mhhe.com/messersmith
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