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anonymous

  • one year ago

Every evening Jenna empies her pockets and puts her change in a jar. At the end of the week she counts her money. One week she had 40 coins, all of them dimes and quarters. When she added them up, she had a total of $7.75. d= number of dimes q= number of quarters How many quarters did Jenna have?

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  1. anonymous
    • one year ago
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    d+q=40 but I don't know what to do next

  2. anonymous
    • one year ago
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    \[( d + q = 40, 10 d + 25 q = 775 )\]

  3. anonymous
    • one year ago
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    The second equation concerns pennies. { d -> 15, q -> 25 }

  4. anonymous
    • one year ago
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    ok so then you can substitute the values and find the answer

  5. anonymous
    • one year ago
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    so 15+25=40

  6. anonymous
    • one year ago
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    I got 15 dimes and 25 quarters

  7. anonymous
    • one year ago
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    Replace d below with 40-q 10 d + 25 q = 775 /. d -> 40 - q solve the following for q: 10 (40 - q) + 25 q = 775

  8. anonymous
    • one year ago
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    15*10+25*25=775

  9. anonymous
    • one year ago
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    thank u :D

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