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12.01.2021 •
Mathematics
The aquarium charges an entrance fee of $5 per child and $12 per adult. On one day, 100 people visited the aquarium. They collected $780 in admission fees. Which system of equations could be used to determine the number of adults that visited the aquarium? Let c represent the number of children and a represent the number of adults.
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Ответ:
We set up 2 equations
A) C + A = 100
B) 5C + 12A = 780
We multiply A by -5
A) -5C -5A = -500 then we add B
B) 5C + 12A = 780
7A = 280
Number of Adults = 40
5C = 780 - 40*12
5C = 780 -480
5C = 300
Number of Children = 60
Step-by-step explanation:
Ответ:
1. 6
2.26
3.42
4.82
erika
1.7 (erika wrong)
2.15 (right)
3.23 (right)
4.43 (right)
6a. 6 is the right one
2(6+2)-7=9