q + d = 38 -------- q = 38 - d
25q + 10d = 680
25(38 - d) + 10d = 680
950 - 25d + 10d = 680
-15d = -270
d = 18
q = 38 - 18
q = 20
Kitty S.
asked • 03/19/18How many coins does Lincoln have?
Lincoln has a collection of quarters and dimes. He has a total of $6.80. The total number of quarters and dimes is 38. How many quarters, and how many dimes does Lincoln have?
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