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Earl has 28 coins, all dimes and quarters. How many of each does he have, if their total value is $5.20?

Mathematics
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d+q=5.20 .10d+.25q=5.20 sub method
wait! d+q=28 sorry
now you sub. lets do dimes. d=28-q so sub it .10(28-q)+.25q=5.20 2.80-.10q+.25q=5.20 .15q=2.40 q=16 soooo then dimes is 12

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does that make sense?
yes, thank u

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