Respuesta :
Answer:
170 children, 88 students, 85 adults
Step-by-step explanation:
x = children
y = students
z = adults
x + y + z = 343
5x + 7y + 12z= 2486
z = 1/2x
you can solve by elimination or substitution or both.
3 equations with 3 unknowns
By solving a system of equations, we conclude that:
- 134 children.
- 142 students
- 67 adults.
How many children, students, and adults attended?
Let's define the variables:
- C = number of children.
- S = number of students.
- A = number of adults.
We know that the theater has a capacity of 343, then:
C + S + A = 343
We also know that there are half as many adults as there are children, then:
A = C/2
Finally, we know that the total profit is $2,468, then:
C*$5,00 + S*$7.00 + A*$12.00 = $2,468
So we have a system of 3 equations:
C + S + A = 343
A = C/2
C*$5,00 + S*$7.00 + A*$12.00 = $2,468
First, we can replace the second equation into the other two to get:
C + S + C/2 = 343
C*$5,00 + S*$7.00 + (C/2)*$12.00 = $2,468
Now we can rewrite the first equation as:
S = 343 - (3/2)*C
Now we can replace that on the first equation:
C*$5,00 + (343 - (3/2)*C)*$7.00 + (C/2)*$12.00 = $2,468
$2,401 + C*$0.50 = $2,468
C = ($2,468 - $2,401)/$0.50 = 134
And we know that:
A = C/2 = 134/2 = 67
And:
S = 343 - (3/2)*C = 343 - (3/2)*134 = 142
Then there are:
- 134 children.
- 142 students
- 67 adults.
If you want to learn more about systems of equations:
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