SOLUTION: 16 coins in his pocket. He has both dimes and quarters. If he has $2.20 in his pocket, how many of each coin does he have?

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Question 1139137: 16 coins in his pocket. He has both dimes and quarters. If he has $2.20 in his pocket, how many of each coin does he have?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
(1) +d+%2B+q+=+16+
(2) +10d+%2B+25q+=+220+ ( in cents )
-------------------------------------------
(2) +2d+%2B+5q+=+44+
(1) +-2d+-+2q+=+-32+
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+3q+=+12+
+q+=+4+
and
(1) +d+%2B+4+=+16+
(1) +d+=+12+
------------------------
12 dimes and 4 quarters
check:
(2) +10%2A12+%2B+25%2A4+=+220+
(2) +120+%2B+100+=+220+
(2) +220+=+220+
OK