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Math Help - Solving Graphic Equations

  1. #1
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    Solving Graphic Equations

    How do you solve this question? Please help me. The weights of two beluga whales and 3 orca whales add up to 36,000 pounds and one of the orcas add up to 13,000 lbs. Using this info only... How much do the beluga's weigh? How much so the orcas weigh?
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  2. #2
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    Are you sure you don't mean: the 2 orca whales add up to 13,000 lbs?

    Because I'm getting an odd answer...

    Let b be the weight of a beluga whale

    Let o be the weight of an orca whale

    You know: "The weights of two beluga whales and 3 orca whales add up to 36,000 pounds"

    So: 2b + 3o = 36,000

    And: "...one of the orcas add up to 13,000 lbs."

    So o = 13,000

    We have 2 orca whales, so their weight is two times the weight of one.
    So its weight is: 2(13,000) = 26,000\,lbs.

    Use the value of o to get the weight of one beluga whale.

    2b + 3(13,000) = 36,000

    2b + 39,000 = 36,000

    2b = -3,000

    b = -1,500

    A negative weight? I don't see how... ?
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  3. #3
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    Question

    Quote Originally Posted by Jonboy View Post
    Are you sure you don't mean: the 2 orca whales add up to 13,000 lbs?

    Because I'm getting an odd answer...

    Let b be the weight of a beluga whale

    Let o be the weight of an orca whale

    You know: "The weights of two beluga whales and 3 orca whales add up to 36,000 pounds"

    So: 2b + 3o = 36,000

    And: "...one of the orcas add up to 13,000 lbs."

    So o = 13,000

    We have 2 orca whales, so their weight is two times the weight of one.
    So its weight is: 2(13,000) = 26,000\,lbs.

    Use the value of o to get the weight of one beluga whale.

    2b + 3(13,000) = 36,000

    2b + 39,000 = 36,000

    2b = -3,000

    b = -1,500

    A negative weight? I don't see how... ?
    Wouldn't it be
    2b + 3o = 36,000
    o = 13,000
    2o (13,000)=26,000
    2b + 26,000=36,000
    Does this make any sense to you? at least up to here?
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  4. #4
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    Quote Originally Posted by noelly_01 View Post
    Wouldn't it be
    2b + 3o = 36,000
    o = 13,000
    2o (13,000)=26,000
    2b + 26,000=36,000
    Does this make any sense to you? at least up to here?
    2(5000) + 26,000 = 36,000
    Is this OK or am I more confused?
    Last edited by noelly_01; May 28th 2008 at 06:17 PM. Reason: Jonboy, don't know if you are still there...
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  5. #5
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    Quote Originally Posted by noelly_01 View Post
    How do you solve this question? Please help me. The weights of two beluga whales and 3 orca whales add up to 36,000 pounds and one of the orcas add up to 13,000 lbs. Using this info only... How much do the beluga's weigh? How much so the orcas weigh?
    Please do NOt ask questions in LiveChat. That's what the Math Forum is for.
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