math hw help?

mike has 20 coins worth $2.30 if the coins ar dimes and quartes only, how many of each type of coin does she have?

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  • 1 decade ago
    Favorite Answer

    2 QUARTERS & 18 DIMES=20 COINS THAT = $2.30

    trust me this is the right answer

  • 18 dimes, and 2 quarters. A dime is 10 cents, so 10 x 18 is a $1.80. $2.30 - $1.80 is 50 cents, so 2 quarters since a quarter is worth 25 cents. This is 20 coins, so this is the right answer. The way to start a question like this is to estimate and keep trying combos until you reach the right one. Or depending on your age you would use a more complex equation to figure the answer out. I hope this helped.

  • 1 decade ago

    Wow. People don't read the whole question I guess.

    18 dimes, 2 quarters.

    It states that there are 20 coins.

    Source(s): My 2nd grade teacher, Mrs. Friebert.
  • 1 decade ago

    You get 3 dimes an 8 quarters.

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  • 1 decade ago

    You would need at least 2 quarters ($.50) to complete this, as the one's place is a 0. From there, you need only $1.80, so it would be 18 dimes and 2 quarters.

    I've forgotten the equation to do this, but this will suffice for now.

  • 1 decade ago

    This is a system of equations problem.

    let x be the number of dimes and y be the number of quarters.

    Since there are 20 coins altogether you can write:

    x + y = 20

    Also you know that the number of quarters and dimes has to add up to $2.30:

    0.10x + 0.25y = 2.30

    So now you have 2 equations and two variables... just solve it

  • 1 decade ago

    let x = dimes Then quarters = 20 -x

    .1(x) + .25(20-x) = 2.30

    .1x + 5 - .25x = 2.30

    -.15x = -2.70

    x = 18

    18 dimes = 1.80 2 quaters = 50 cent

    I don't think you should use a system of equations if you can subtract one from the other.

  • Anonymous
    1 decade ago

    2 quarters and 18 dimes

  • 1 decade ago

    18 dimes and 2 quarters

  • 1 decade ago

    2 quarters and 18 dimes

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