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anonymous

  • 4 years ago

A collection of 70 coins consisting of dimes, quarters, and half-dollars has a value of 17.75. there are three timesas many quarters as dimes. Find the number of ecah kind of coin

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  1. saifoo.khan
    • 4 years ago
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    x+y+z=70;x=3y;4y+z=70 .25(3y)+.10y+.5z=17.75 .85y+.5z=17.75 85y+50z=1775 200y+50z=3500 ---------------- 115y=1725 y=15 x=45 z=10 There are 45 quarters, 15 dimes, and 10 half-dollars in the coin collection..

  2. anonymous
    • 4 years ago
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    Thank you, but i still don't understand how you got the result. Would you please explain with a little bit of details. Thanks oce again :)

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