170 Chapter 3 Fractions and Mixed Numbers: Addition and Subtraction 75. A chemist mixed liter (L) of water with L of alcohol. Then he used one-quarter of the mixture in an Day Distance 4 10 Monday mi 7 10 Tuesday mi 9 10 Wednesday mi 5 10 Thursday mi 13 10 Friday mi 17 10 Saturday mi Week Amount of Rainfall 2 10 1 in. 7 10 2 in. 9 10 3 in. 17 10 4 in. experiment. How much mixture did he use? 76. Malcom planted tomatoes in of his garden. He planted cucumbers in of the garden and cabbage in . The remaining still has not yet been planted. A deer came in one night and ate of the plants in the planted area.What fraction of the garden did the deer eat? 77. Thilan has taken up a new exercise program. He walks 6 days per week. One week he walked the distances given in the table. a. Find the total distance he walked for the week. b. Find the average distance walked per day. 78. Denzel recorded the weekly rainfall for his town for 4 weeks of summer. a. Find the total amount of rainfall for this 4-week period. b. Find the average rainfall per week. 13 1 7 1 7 3 7 2 7 7 8 5 8 For Exercises 79–82, find the perimeter and the area. 79. 80. 81. 82. May For Exercises 83–86, translate the phrase to a mathematical expression, then simplify. 83. The sum of three-fifths and two-fifths 84. Seven-ninths more than five-ninths 85. The difference of eleven-fifteenths 86. Two-sevenths subtracted from five-sevenths and eight-fifteenths Sun Mon Tues Wed Thur Fri Sat 25 4 in. 30 4 in. 13 3 yd 22 3 yd 7 8 m 15 8 m 5 8 ft 3 8 ft
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