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Math Help - How Many Yards Did Amy Use?

  1. #1
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    Smile How Many Yards Did Amy Use?

    Mary and Amy had a total of 20 yards of material from which to make costumes. Mary used three times more material to make her costume than Amy used, and 2 yards of material was not used. How many yards of material did Amy use for her costume?

    MY SET UP:

    Let M = Mary

    Let A = Amy

    M + A = 20 yards
    3M + A = 18 yards

    I equated 3m + A to 18 because the question stated that 2 yards were not used.

    Is this the correct group of equations or is the entire set up wrong?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by magentarita View Post
    Mary and Amy had a total of 20 yards of material from which to make costumes. Mary used three times more material to make her costume than Amy used, and 2 yards of material was not used. How many yards of material did Amy use for her costume?

    MY SET UP:

    Let M = Mary

    Let A = Amy

    M + A = 20 yards
    3M + A = 18 yards

    I equated 3m + A to 18 because the question stated that 2 yards were not used.

    Is this the correct group of equations or is the entire set up wrong?
    a valiant effort, but not really.

    we only used 18 yards. so if M is the amount Mary used and A is the amount Amy used, then we have

    M + A = 18 ..................(1)

    if Mary used 3 times as much as Amy, it means M = 3A

    thus 3A + A = 18

    etc etc etc
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  3. #3
    MHF Contributor
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    Ok...

    Creating proper equations for given word problems is the main difference between students of math and math professionals like the tutors on this site. I have not been able to set up the right equations for questions since I started pre-calculus (and before this course). The course has two more semesters because we started in August.
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