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Algebra

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I have only dimes, nickels, and pennies in my wallet. Seven of the coins are dimes, 25 percent are nickels and 5/9 of them are pennies. How many coins do I have?

  • Algebra -

    let the total be x

    7 + x/4 + (5/9)x = x
    times 36
    252 + 9x + 20x = 36x
    252 = 7x
    x = 36

    You have 36 coins

    check:
    (1/4)(36) = 9 nickels
    (5/9)(36) = 20 pennies
    dimes = 7
    total = 7+9+20 = 36

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