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Nookie1986 [14]
3 years ago
13

The zurassic zoo charges $11 each for adult admissions and $4 each for each child. The total bill for the 138 people from a scho

ol trip was $839. How many adults and how many children went to the zoo?
Mathematics
1 answer:
LenaWriter [7]3 years ago
4 0

The number of adults = 41

The number of children = 97

Step-by-step explanation:

Let x be the number of adults and

y be the number of children

then according to the given conditions

x+y = 138\ \ \ Eqn\ 1\\11x+4y = 839\ \ \ Eqn\ 2

From equation 1:

x = 138-y

Putting in equation 2

11(138-y)+4y = 839\\1518-11y+4y = 839\\1518 -7y = 839\\-7y = 839-1518\\-7y = -679\\

Dividing both sides by -7

\frac{-7y}{-7} = \frac{-679}{-7}\\y = 97

Putting y = 97 in equation 1

x+ 97 = 138\\x = 138-97\\x = 41

Hence,

The number of adults = 41

The number of children = 97

Keywords: Linear equations variables

Learn more about linear equations at:

  • brainly.com/question/8955867
  • brainly.com/question/9045597

#LearnwithBrainly

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Question from Amanda, a parent:

what is the area of a circle with a circumference of 3000 metres?


Amanda,

The area of a circle is given by the formula A = π r2, where A is the area and r is the radius. The circumference of a circle is C = 2 π r.

If we "solve for r" in the second equation, we have r = C / (2 π ). Now we use this to replace r in the first equation: A = π [ C / (2 π ) ]2.

When we simplify this, we get A = C2 / (4 π).

Now you can put your value of C into this equation and find A. Remember, π is about 3.1416.
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How do uou do this problem
Ronch [10]
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3 years ago
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anzhelika [568]

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Answer:

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