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Math Help - Fraction Problems

  1. #1
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    Question Fraction Problems

    I don't get these problems, can someone help me out?

    1. Jeff added two fractions. Lydia subtracted the same two fractions. Jeff's answer was 3/4 greater than Lydia's. What could the fractions be?

    2. To calculate 7 1/8 - 2 2/3, Lee added 1/3 to 4 1/8. Why do you think that Lee did this?

    The answers/solutions/equation to these are simple but I can't seem to get a hold of them please help. Thank you!
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by puppy_wish View Post
    I don't get these problems, can someone help me out?

    1. Jeff added two fractions. Lydia subtracted the same two fractions. Jeff's answer was 3/4 greater than Lydia's. What could the fractions be?

    2. To calculate 7 1/8 - 2 2/3, Lee added 1/3 to 4 1/8. Why do you think that Lee did this?

    The answers/solutions/equation to these are simple but I can't seem to get a hold of them please help. Thank you!
    1. Let the fractions be x and y.

    x + y = z .......................(1)
    x - y = z - 3/4 ................(2)

    => 2y = 3/4
    => y = 3/8

    so x + 3/8 = z .........................(3)
    and -x + 3/8 = z - 3/4 ..............(4)

    => 2x = 3/4
    => x = 3/8

    so the fractions are x = y = 3/8


    2. To calculate 7 1/8 - 2 2/3, Lee added 1/3 to 4 1/8. Why do you think that Lee did this?

    2 2/3 is almost 3. so what Lee did was to subtract 3 from 7 1/8 to get 4 1/8. But now, since 2 2/3 is actually not 3, he had to make up for subtracting a greater number by adding the difference. (the difference between 2 2/3 and 3 is 1/3).
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  3. #3
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    thank you soooooooooooooooooooooooooo much!!!
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by puppy_wish View Post
    thank you soooooooooooooooooooooooooo much!!!
    you're very welcome. good luck with your class. i have one of my own to go to now. so catch you later
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