Kelsey has a collection of 40 coins, consisting of dimes and quarters, worth $7.60. How many coins of each kin?

Kelsey has a collection of 40 coins, consisting of dimes and quarters, worth $7.60. How many coins of each kind does she have?

DWRead2013-06-23T21:21:00Z

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d + q = 40
q = 40 - d

0.10d + 0.25q = 7.60
0.10d + 0.25(40 - d) = 7.60
0.10d + 10 - 0.25d = 7.60
0.15d = 2.40
d = 2.40/0.15 = 16
q = 40 - d = 24

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