05-09-2017
Mathematics

contestada

Joey has $5.75 made up of dimes and quarters. If Joey has 38 coins, how many of each coin does he have?

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kphung76127 kphung76127

05-09-2017

d+q=38
0.1d+0.25q=5.75

Multiply the second equation by -10 and use elimination method.
-d-2.5q=-57.5
d+q=38

-1.5q=-19.5
q=13

Plug quarter number in
d+13=38
d=25

Final answer: 13 quarters, 25 dimes

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