College of Marin Study Guide for Math 95 A,B - Pearson Learning ...

Solutions to the Sample Finals 48[4.7] 49. A car went 250 miles in 4 hours. How far did it go in 1 hour?Let x the distance in miles the car went in one hour.x miles 250 miles250---------------- ----------------------- ; 4x 1 • 250; x -------- 62.5 miles1 hour 4 hours4[5.1] 50. Write fractional notation for the ratio of 4 to 5.The ratio of 4 to 5 4--5[5.3] 51. Solve18-----4x-----104 • x 10 • 18; 4x 180; x 180-------- 454[5.2] 52. Find the rate as a ratio of distance to time: 120 miles, 3 hours120 milesRatio of distance to time ----------------------- 40 mph3 hours[5.2] 53. An 8-pound chicken contains 36 servings. What is the ratio in servingsper pound?Ratio in servings per pound 36 servings---------------------------8 pounds 4.5 servings per pound[5.4] 54. A car travels 800 miles in 3 days. At this rate, how many miles will ittravel in 15 days? (Set up a proportion, then solve.)Let x the distance in miles the car traveled in 15 days.x miles------------------15 daysx800 miles ----------------------- ; 3x 15 • 800; 3x 12,000;3 days12,000--------------- 4000 miles3[5.4] 55. If 7 tickets cost $45.50, what is the cost of 17 tickets? (Set up a proportion,and then solve.)Let x the cost of 17 tickets in $.7 tickets-------------------45.5017 tickets773.50 ---------------------- ; 7x 17 • 45.50; x --------------- $110.50$ x7