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WITCHER [35]
1 year ago
12

Plss help get brainiest if right!!

Mathematics
1 answer:
Fantom [35]1 year ago
8 0

Answer:

  • 18 quarters
  • 7 dimes

Step-by-step explanation:

The given relations can be used to write two equations describing the coins. One equation can express the total number of coins; the other, their total value.

__

<h3>setup</h3>

Let d and q represent the numbers of dimes and quarters, respectively. The the total number of coins is ...

  d + q = 25

and their total value is ...

  0.10d +0.25q = 5.20

<h3>solution</h3>

Using the first equation to write an expression for d, we can substitute that into the second equation.

  d = 25 -q

  0.10(25 -q) +0.25q = 5.20

  0.15q = 2.70 . . . . . . . . . collect terms, subtract 2.50

  q = 18 . . . . . . . . . . . divide by 0.15

  d = 25 -q = 7

You have 18 quarters and 7 dimes.

_____

<em>Additional comment</em>

It is generally convenient to solve for the number of the higher-value coin. That way, the numbers in the equations stay positive, tending to reduce errors.

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murzikaleks [220]
So here we're dealing with equivalent fractions.
It's really simple to find the answer, so I'll try to explain the best I can.

2 dogs / 5 cats is really just 2/5.
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We need to multiply the denominator (5) by 28, so that we can get 140. What we have now is ?/140.

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3 years ago
A university knows from historical data that 25% of students in an introductory statistics class withdraw before completing the
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