47. 48. 49. 50. 2 2 a5 38 3 5 3 8 3 2 9 8 5 16 2 3 2 71. The information in the graph shows the distribution of a college student body by class. a. What fraction of the student body consists of upper classmen (juniors and seniors)? b. What fraction of the student body consists of freshmen and sophomores? Section 3.3 Addition and Subtraction of Unlike Fractions 187 Concept 2: Order of Operations For Exercises 51–64, simplify by applying the order of operations. Write the answer as a fraction. (See Examples 5 and 6.) 51. 52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 3 Concept 3: Applications Involving Unlike Fractions 65. When doing her laundry, Inez added cup of bleach to cup of liquid detergent. How much total liquid is added to her wash? 66. What is the smallest possible length of screw needed to pass through two pieces of wood, one that is in. thick and one that is in. thick? 67. Before a storm, a rain gauge has in. of water. After the storm, the gauge has in. How many inches of rain did the storm deliver? (See Example 7.) 68. In one week it rained in. If a garden needs in. of water per week, how much more water does it need? 69. A watering trough holds 5 gal of water. In the summer, water evaporates at a rate of approximately gal per day. After 4 days, Jeff pours in another gallon and a half of water ( gal). How much water is in the trough? (See Example 8.) 70. A contractor hired two electricians to do a job. One did of the job and the other did of the job. Did the job get completed? If not, what fraction of the job is left? 9 32 1 8 1 2 7 8 3 8 3 4 a1 2 1 3 b a2 5 b 3 10 a1 4 b 6 2 3 b 7 12 a3 2 b 5 4 a2 5 b 1 25 1 6 3 7 14 15 4 5 5 8 16 35 a2 5 9 10 b 5 6 a 7 10 1 5 b 8 3 11 12 1 9 7 9 5 6 3 8 1 4 3 5 6 7 2 5 2 3 1 2 3 4 a2 3 1 6 b a1 2 1 3 b 1 3 1 9 1 27 1 81 1 2 1 4 1 8 1 16 5 8 3 10 1 12 1 20 5 8 7 24 Distribution of Student Body by Class Freshman Senior Junior Sophomore 1 6 7 36 5 18 13 36
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