Algebra

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Anne has 20 coins in her pocket consisting of nickels and dimes only. The total value of the coins is $1.45. How many nickels and how many dimes does she have? (Let x represent the number of nickels and y represent the number of dimes.)

  • Algebra -

    d represents Dimes
    n represents Nickles
    Total number of coins;
    d + n = 20, n = (20-d) ...1
    Total value of coins;
    10d + 5n = 145 ...2

    substitute equation 2 with equation 1 for n,
    10d + 5(20-d) = 145,
    10d + 100 - 5d =145,
    10d -5d = 145 -100, d = 45/5 = 9 dimes
    20 - 9 = 11 nickles

  • Algebra -

    wrong

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