40 CHAPTER 1 Critical Thinking Skills 12. Rocky Mountain National Park The scale on a map of Rocky Mountain National Park indicates that 1 inch on the map equals about 3 4 mile in the park. If the distance on the map from Grand Lake Entrance to Holzwarth Historic Site is about 10 inches, how far is this distance in the park? 7.5 miles 13. Payment Shortfall Kono gets $12.75 per hour with time and a half for any time over 40 hours per week. If she works a 50-hr week and gets paid $652.25, by how much was she underpaid? $49.00 14. Magic Square Create a magic square by using the numbers 5, 10, 15, 20, 25, 30, 35, 40, and 45. The sum of the numbers in every row, column, and diagonal must be 75. * 15. A Drive to the Beach Mary drove from her home to the beach that is 30 mi from her house. The first 15 mi she drove at 60 mph, and the next 15 mi she drove at 30 mph. Would the trip take more, less, or the same time if she traveled the entire 30 mi at a steady 45 mph? Less time if she had driven at 45 mph for the entire trip 16. Chili Recipe Three teaspoons equal one tablespoon. A recipe for chili calls for 1 2 teaspoon of salt for 2 pounds of ground beef. How many tablespoons of salt are needed for 6 pounds of ground beef? tablespoon 1 2 17. Area of a Concrete Walkway A 10 meter by 12 meter rectangular lawn has a concrete walkway 1 meter wide around the outside of the lawn. What is the area of the walkway? 48 square meters 18. Jelly Bean Guess One guess is off by 9, another guess is off by 17, and yet another guess is off by 31. How many jelly beans are in the following jar? 243 jelly beans My guess is 260 HOW MANY BEANS My guess is 274 My guess is 234 19. Buying Plants David wants to purchase nine herb plants. Countryside Nursery has herbs that are on sale at three for $3.99. David has a coupon for 25% off an unlimited number of herb plants at the original price of $1.75 per plant. a) Determine the cost of purchasing nine plants at the sale price. $11.97 b) Determine the cost of purchasing nine plants if the coupon is used. $11.81 c) Which is the least expensive way to purchase the nine plants, and by how much? Save 16 cents by using the 25% off coupon. 20. Arranging Letters In how many different ways can four letters, A, B, C, D, be arranged? 24 *See Instructor Answer Appendix
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