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xokatexo Group Title

1. Vicki has $2.80 in quarters and dimes. The number of dimes is 7 less than the number of quarters. Find the number she has of each kind. 2. A purse containing $3.20 in quarters and dimes has, in all, 20 coins. Find the number of each kind of coin.

  • 2 years ago
  • 2 years ago

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  1. xokatexo Group Title
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    can you show the substitution work?

    • 2 years ago
  2. zepdrix Group Title
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    |dw:1348685007820:dw| try to solve for Q from here :)

    • 2 years ago
  3. xokatexo Group Title
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    q=-.56

    • 2 years ago
  4. xokatexo Group Title
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    thats not right....

    • 2 years ago
  5. zepdrix Group Title
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    hmm lets see

    • 2 years ago
  6. xokatexo Group Title
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    Q(Q-7)=2.80 2Q-7Q=2.80 -5Q=2.80 ---- ------ -5 -5 Q=-.56

    • 2 years ago
  7. xokatexo Group Title
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    @zepdrix

    • 2 years ago
  8. zepdrix Group Title
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    woops don't get confused by my brackets :C Q+(Q-7) = Q+Q-7

    • 2 years ago
  9. xokatexo Group Title
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    wait what?

    • 2 years ago
  10. zepdrix Group Title
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    oh woops i messed up from the start T.T oh goodness. im sorry bout that.. need to fix that..

    • 2 years ago
  11. kropot72 Group Title
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    The two equations are as follows: 25Q + 10d = 280 d = Q - 7

    • 2 years ago
  12. zepdrix Group Title
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    yah what kropot said, sorry bout that :C

    • 2 years ago
  13. xokatexo Group Title
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    k got it THANKS @kropot72

    • 2 years ago
  14. kropot72 Group Title
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    You're welcome :)

    • 2 years ago
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