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



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mr.luna
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d+q=5.20 .10d+.25q=5.20 sub method

mr.luna
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wait! d+q=28 sorry

mr.luna
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now you sub. lets do dimes. d=28q so sub it
.10(28q)+.25q=5.20
2.80.10q+.25q=5.20
.15q=2.40
q=16
soooo then dimes is 12

mr.luna
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does that make sense?

gianellelol
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yes, thank u