RATIO AND PROPORTION  2

PROBLEMS (2)

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"Out of":  The ratio    Part 
Whole

12.  In a class, 3 out of 5 students are girls; there are 30 students; how
12.  many are girls?  18

13.  In a survey, 7 out of 8 people answered No; 168 people were
11 . surveyed; how many answered No?  147.   How many answered
13.  Yes?  21

14.  In the sophomore class, there are 630 students.  2 out of 3 have a
14.  C average.  How many have a C average?  420.   How many do
14.  not have a C average?  210

15.  A company employs 450 people, and 7 out of 10 are women.  How
15.  many women employees are there?  315.   How many men?  135

Percent: Ratio to 100

16.  Express each ratio as a percent.

a)    28 
100
 =  28%   b)    72 
100
 =  72%   c)   98.5
100
 =  98.5%

17.  a)  How do you know this is a proportion?

11
44
 =   25 
100

11 is the fourth part of 44, just as 25 is the fourth part of 100.

15.  a)  11 out of 44 is what percent?  25%

15.  b)  How do you know this is a proportion?

 9 
50
 =   18 
100

Two times 50 is 100, and two times 9 is 18.

15.  a)  9 out of 50 is what percent?  18%

15.  c)  How do you know this is a proportion?

  8  
200
 =    4  
100

Half of 200 is 100, and half of 8 is 4.

15.  a)  8 out of 200 is what percent?  4%

18.  Complete each proportion.  In each case, the 1st term is what
18.  percent of the 2nd?

   8
16
 =   50 
100
 = 50%.    9
36
 =   25 
100
 = 25%.    7
35
 =   20 
100
 = 20%.
  11
50
 =   22 
100
 = 22%.    8
25
 =   32 
100
 = 32%.    7
20
 =   35 
100
 = 35%.
   24
200
 =   12 
100
 = 12%.    15
300
 =    5  
100
 = 5%.    42
600
 =    7  
100
 = 7%.

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