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saveliy_v [14]
3 years ago
7

The aquarium charges an entrance fee of $5 per child and $12 per adult. On one day, 100 people visited the aquarium. They collec

ted $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.
Mathematics
1 answer:
igor_vitrenko [27]3 years ago
6 0

Answer:

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:

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Answer:

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Step-by-step explanation:

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3 years ago
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Read 2 more answers
heather has divided $6300 between two invesments, one paying 9%, the other paying 4%. If the return on her investment is $372, h
Ganezh [65]
Assuming that the two investments are  X & Y
X + Y = 6300
X = 6300 - Y                                       (1)

9/100X + 4/100 Y = 372                       (2)
replacing X from (1) into (2)
9/100(6300-Y) + 4/100 Y = 372
567 - 9/100Y +4/100Y = 372
(-9+4)/100Y = 372 - 567
5/100Y = -195
Y = 100*195/5 = 3900
From (1) we can get X
X = 6300 - 3900 = 2400

I hope this is helpful 



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3 years ago
I need help on this question​
wel

Answer:

The attachment is black

Step-by-step explanation:

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5 0
3 years ago
What is 0.366 in expanded notation
oksano4ka [1.4K]
3 × 1/10 + 6 × 1/100 + 6 × 1/1000
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