Page 384 - Basic College Mathematics with Early Integers

S E C T ION 5 .1 I RATIOS 361

27. Of the U.S. mountains that are over 14,000 feet in 28. Citizens of the United States eat an average of
elevation, 57 are located in Colorado and 19 are 25 pints of ice cream per year. Residents of the New
located in Alaska. Find the ratio of the number of England states eat an average of 39 pints of ice cream
mountains over 14,000 feet found in Alaska to the per year. Find the ratio of the amount of ice cream
number of mountains over 14,000 feet found in eaten by New Englanders to the amount eaten by the
Colorado. (Source: U.S. Geological Survey) average U.S. citizen. (Source: International Dairy
Foods Association)

Blood contains three types of cells: red blood cells, white blood cells, and platelets. For approximately every 600 red
blood cells in healthy humans, there are 40 platelets and 1 white blood cell. Use this information for Exercises 29 and 30.
(Source:American Red Cross Biomedical Services)

29. Write the ratio of red blood cells to platelet cells. 30. Write the ratio of white blood cells to red blood cells.

Objective Write each rate as a fraction in simplest form. See Examples 7 and 8.

31. 5 shrubs every 15 feet 32. 14 lab tables for 33. 15 returns for 100 sales 34. 150 graduate students
28 students for 8 advisors

35. 8 phone lines for 36. 6 laser printers for 37. 18 gallons of pesticide 38. 4 inches of rain in
36 employees 28 computers for 4 acres of crops 18 hours

Objective Write each rate as a unit rate. See Examples 9 and 10.

39. 375 riders in 5 subway cars 40. 275 miles in 11 hours

41. A hummingbird moves its wings at a rate of 5400 42. A bat moves its wings at a rate of 1200 wingbeats a
wingbeats a minute.Write this rate in wingbeats per minute.Write this rate in wingbeats per second.
second.