Basic Mathematics for College Students

28. iPHONES A student had
    135 text messages saved on
    her 16-gigabyte iPhone. She
    deleted 27 text messages
    (600 kilobytes) to free up
    some storage space. Over
    the next 7 days, she received
    19 text messages
    (255 kilobytes). How many
    text messages are now
    saved on her phone?

TRY IT YOURSELF

29. FORESTS Canada has 2,342,949 fewer square miles
    of forest than Russia. The United States has
    71,730 fewer square miles of forest than Canada. If
    Russia has 3,287,243 square miles of forest (the most
    of any country in the world), how many square miles
    does the United States have? (Source: Maps of
    World.com)


30. VACATION DAYS Workers in France average
    5 fewer days of vacation a year than Italians.
    Americans average 24 fewer vacation days than the
    French. If the Italians average 42 vacation days each
    year (the most in the world), how many does the
    average American worker have a year? (Source:
    infoplease.com)


31. BATMAN As of 2008, the worldwide box office
    revenue for the following Batman films are The Dark
    Knight(2008): $998 million,Batman(1989):
    $411 million,Batman Forever(1995): $337 million,
    Batman Begins(2005): $372 million,Batman Returns
    (1992): $267 million, and Batman & Robin(1997):
    $238 million. What is the total box office revenue for
    the films? (Source: Wikipedia)


32. SOAP OPERAS The total number of viewers of the
    top 4 TV soap operas for the week of December 1,
    2008, were:The Young and the Restless(5,016,000),
    The Bold and the Beautiful(3,587,000),General
    Hospital(2,853,000), and As the World Turns
    (2,694,000). What is the total number of viewers of
    these programs for that week? (Source:
    soapoperanetwork.com)


33. MED SCHOOL There were 375 fewer applications
    to U.S. medical schools submitted by women in
    2007 compared to 2008. If 20,735 applications were
    submitted by women in 2008, how many were
    submitted in 2007? (Source: AAMC: Data
    Warehouse)


34. AEROBICS A 30-minute high-impact aerobic
    workout burns 302 calories. A 30-minute low-impact
    workout burns 64 fewer calories. How many calories
    are burned during the 30-minute low-impact
    workout?
    35. TRAVEL How much money will a family of six save
    on airfare if they take advantage of the offer shown in
    the advertisement?

1.6 Problem Solving 77

© ICP-UK/Alamy

Discount Airfare

NOW!NOW!NOW! $516

WAS: $593

Roundtrip per person

Los Angeles/Orlando

GB Used

27 GB 14 GB 13 GB

GB Free

Audio Video Photos

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36. DISCOUNT LODGING A hotel is offering rooms
    that normally go for $129 per night for only $99 a
    night. How many dollars would a traveler save if he
    stays in such a room for 5 nights?


37. PAINTING One gallon of latex paint covers
    350 square feet. How many gallons are needed if the
    total area of walls and ceilings to be painted is
    9,800 square feet, and if two coats must be
    applied?


38. ASPHALT One bucket of asphalt sealcoat covers
    420 square feet. How many buckets are needed if a
    5,040-square-foot playground is to be sealed with two
    coats?


39. iPODS The iPod shown has 80 gigabytes (GB) of
    storage space. From the information in the bar graph,
    determine how many gigabytes of storage space are
    used and how many are free to use.


40. MULTIPLE BIRTHS Refer to the table on the next
    page.
    a. Find the total number of children born
    in a twin, triplet, or quadruplet birth for the year
    2006.
    b. Find the total number of children born
    in a twin, triplet, or quadruplet birth for the year
    2005.
    c. In which year were more children born in these
    ways? How many more?