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MrZone9

  • 4 years ago

A box contains 35 coins in quarters and nickels worth $3.15 How many of each coin are there (system of liner eqations problem)

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  1. abtrehearn
    • 4 years ago
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    Q + N = 35 25Q + 5N = 315.

  2. abtrehearn
    • 4 years ago
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    Simplyf the second equation, solve the first for one of its unknowns and substitute into the simplified second equation, and you're well on your way to the solution.

  3. anonymous
    • 4 years ago
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    careful with the decimals! \[25q+5(35-q)=315\] \[

  4. anonymous
    • 4 years ago
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    \[20x+175=315\] \[20x=140\] \[x=7\]

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