Fundamentals of Mathematics, 2008a

462 CHAPTER 7. RATIOS AND RATES
7.9.1.3 Applications of Proportions (Section 7.4)
Exercise 7.9.28
On a map, 3 inches represents 20 miles. How many miles does 27 inches represent?
Exercise 7.9.29 (Solution on p. 473.)
A salt solution is composed of 8 parts of salt to 5 parts of water. How many parts of salt are there
in a solution that contains 50 parts of water?
Exercise 7.9.30
A model is built to 4 15
scale. If a particular part of the model measures 8 inches in length, how long
is the actual structure?
Exercise 7.9.31 (Solution on p. 473.)
The ratio of ammonia to air in a container is 3 40
How many milliliters of air should be in a container
that contains 8 milliliters of ammonia?
Exercise 7.9.32
A 4-foot girl casts a 9-foot shadow at a particular time of the day. How tall is a pole that casts a
144-foot shadow at the same time of the day?
Exercise 7.9.33 (Solution on p. 473.)
The odds that a particular event will occur are 11 to 2. If this event occurs 55 times, how many
times would you predict it does not occur?
Exercise 7.9.34
Every 1 3 4
teaspoon of a multiple vitamin, in granular form, contains 0.85 the minimum daily
requirement of vitamin A. How many teaspoons of this vitamin are required to supply 2.25 the
minimum daily requirement?
7.9.1.4 Percent and Fractions of One Percent (Section 7.5,Section 7.6)
For problems 35-39, convert each decimal to a percent.
Exercise 7.9.35 (Solution on p. 473.)
0.16
Exercise 7.9.36
0.818
Exercise 7.9.37 (Solution on p. 473.)
5.3536
Exercise 7.9.38
0.50
Exercise 7.9.39 (Solution on p. 474.)
3
For problems 40-48, convert each percent to a decimal.
Exercise 7.9.40
62%
Exercise 7.9.41 (Solution on p. 474.)
1.58%
Exercise 7.9.42
9.15%
Exercise 7.9.43 (Solution on p. 474.)
0.06%
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