
Concept explainers
a.
To organize: The given information in a two-way table.
a.

Explanation of Solution
Given Information:
Number of tickets sold to play =1809
Number of tickets for main floor =800
Number of adult tickets on the main floor =2x+y
Number of child tickets on the main floor =x−40
Number of adult tickets in the balcony =x+2y
Number of child tickets in the balcony =3x−y−80
Table:
Creating the two-way table,
Main FloorBalconyTotalChildx−403x−y−80Adult2x+yx+2yTotal80010091809
b.
To find: The values of x and y .
b.

Answer to Problem 31E
x=249 and y=93 .
Explanation of Solution
Given Information:
Number of tickets sold to play =1809
Number of tickets for main floor =800
Number of adult tickets on the main floor =2x+y
Number of child tickets on the main floor =x−40
Number of adult tickets in the balcony =x+2y
Number of child tickets in the balcony =3x−y−80
Calculation:
Calculating the values with the help of equations formed through two-way table,
From column 1 ,
(x−40)+(2x+y)=800 3x+y=840 −(i)
From column 2,
(3x−y−80)+(x+2y)=1009 4x+y=1089 −(ii)
Subtracting (i) from (ii) ,
x=249
Putting this value of x in (i) ,
3(249)+y=840 y=93
Thus, x=249 and y=93 .
c.
To find: The percentage of adult tickets.
c.

Answer to Problem 31E
Percentage of adult tickets is about 57% .
Explanation of Solution
Given Information:
Number of tickets sold to play =1809
Number of tickets for main floor =800
Number of adult tickets on the main floor =2x+y
Number of child tickets on the main floor =x−40
Number of adult tickets in the balcony =x+2y
Number of child tickets in the balcony =3x−y−80
Calculation:
Putting x=249 and y=93 to complete the two-way table,
Main FloorBalconyTotalChild209574783Adult5914351026Total80010091809
Using the information from completed two-way table,
Percentage of adult tickets =10261809≃0.57 or 57%
Thus, percentage of adult tickets is about 57% .
d.
To find: The percentage of child tickets that are balcony tickets.
d.

Answer to Problem 31E
Percentage of child tickets that are balcony tickets is about 73% .
Explanation of Solution
Given Information:
Number of tickets sold to play =1809
Number of tickets for main floor =800
Number of adult tickets on the main floor =2x+y
Number of child tickets on the main floor =x−40
Number of adult tickets in the balcony =x+2y
Number of child tickets in the balcony =3x−y−80
Calculation:
Using the information from completed two-way table,
Total child tickets =783
Total child tickets in balcony =574
Percentage of child balcony tickets =574783≈0.73 or 73%
Thus, percentage of child tickets that are balcony tickets is about 73% .
Chapter 11 Solutions
BIG IDEAS MATH Algebra 1: Common Core Student Edition 2015
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