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In a collection of nickels, dimes and quarters, there are twice as many dimes as nickels, and 4 fewer quarters than dimes. The total value of the coins is $5.75.
How many nickels are there in the collection ?

  • math - ,

    Dealing with NUMBER of coins:
    nickels ---- x
    dimes ----- 2x
    quarters ---- 2x - 4

    dealing with VALUE of our coins:
    5x + 10(2x) + 25(2x-4) = 575

    solve for x and back-substitute

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