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anonymous

  • 4 years ago

Martha went shopping & bought each of her five nephews a gift, either a video costing $14.95 or a CD costing $16.88 She spent $76.88 on their gifts. How many videos & How many CD's did she buy?

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  1. Mertsj
    • 4 years ago
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    v+c=5 14.95v+16.88c=76.88 Multiply the second equation to get rid of the decimals Replace v in the second equation with 5-c from the first equation and solve. I believe it was 10 nephews last night.

  2. anonymous
    • 4 years ago
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    It wasn't me. This is my 1st day on this group. Please, go check original poster from last night!

  3. anonymous
    • 4 years ago
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    I still don't get it.

  4. Mertsj
    • 4 years ago
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    Did you multiply the second equation by 100 to get rid of the decimals?

  5. anonymous
    • 4 years ago
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    (100)14.95v + (100)16.88c = (100)76.88 1495v + 1688c = 7688 Is that right?

  6. Mertsj
    • 4 years ago
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    Yes.

  7. Mertsj
    • 4 years ago
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    Now from the first equation, v=5-c replace v with 5-c and solve

  8. anonymous
    • 4 years ago
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    1495v + 1688c = 7688 1495(5-c) + 1688c =7688 7475-1495c+1688c=7688 7475-193c=7688 -7475 -7475 -193c=213 Is that right?

  9. Mertsj
    • 4 years ago
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    7475-193c=7688 Should be 7475+193c

  10. anonymous
    • 4 years ago
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    I got the 7475+193c=7688 I messed up my signs 7475+193c=7688 -7475 -7475 193c=213 c=1.10

  11. Mertsj
    • 4 years ago
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    Are you sure you copied the problem right? It should come out to be a whole number of videos and cd's. Someone posted this same problem last night and I thought it was 10 nephews. Please check the problem.

  12. anonymous
    • 4 years ago
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    let me check

  13. anonymous
    • 4 years ago
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    Her total is $76.68 not 76.88 as I posted,

  14. Mertsj
    • 4 years ago
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    That works

  15. anonymous
    • 4 years ago
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    1495v + 1688c = 7668 1495(5-c) + 1688c =7668 7475-1495c+1688c=7668 7475+193c=7668 -7475 -7475 193c=193 So she bought 1 CD

  16. Mertsj
    • 4 years ago
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    Yes and 4 videos

  17. anonymous
    • 4 years ago
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    Thank u

  18. Mertsj
    • 4 years ago
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    yw

  19. anonymous
    • 4 years ago
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    It makes sense. I have trouble setting up application problems.

  20. Mertsj
    • 4 years ago
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    Everyone does in the beginning. The key is to keep practicing.

  21. anonymous
    • 4 years ago
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    How do we give medals? I am new. I would like to give u a medal

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