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Talja [164]
3 years ago
9

3. Theresa has 20 coins that are dimes and quarters. Together

Mathematics
1 answer:
KiRa [710]3 years ago
3 0

Answer:

  • 15 dimes
  • 5 quarters

Step-by-step explanation:

Let q represent the number of quarters Theresa has. Then the value of her coins is ...

  0.25q + 0.10(20 -q) = 2.75

  0.15q = 0.75 . . . . . . . . . subtract 2.00, collect terms

  q = 0.75/0.15 = 5

Theresa has 5 quarters and 15 dimes.

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