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25 June, 11:35

Jessica has 48 coins, some of them are nickels and some are dimes. How many of each does she have if she has $3.25 total?

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Answers (2)
  1. 25 June, 12:02
    +1
    Jessica will have 17 Dimes and 31 Nickels.

    Nickel = 0.05

    Dime = 0.10

    XNickels + YDimes = 3.25

    0.05X + 0.1Y = 3.25

    You could do this using trial and error.

    You know the maximum amount of dimes you could have is 32. Because 32 * 0.1 = 3.20. If you had 33 dimes, you'd go over the limit.

    You also know you need to have 48 coins. If you have 32 dimes and 1 nickel, you will not have 48 coins.

    You can try any number below 32. I will try 16 because it's half of 32.

    16 * 0.1 = 1.60

    48 - 16 = 32 coins left

    32 * 0.05 = 1.60

    1.60 + 1.60 = 3.20

    We're a nickel off, therefore we need to remove a nickel and add a dime.

    17 * 0.1 = 1.70

    48 - 17 = 31

    31 * 0.05 = 1.55

    1.70 + 1.55 = 3.25

    Jessica will have 17 Dimes and 31 Nickels.
  2. 25 June, 15:21
    -2
    Jessica has 30 dimes and 5 Nickels
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