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    thatkygirl's Avatar
    thatkygirl Posts: 1, Reputation: 1
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    #1

    Jun 2, 2008, 03:21 PM
    Balancing a fulcrum.
    Tom, and Harry weigh 50, 85, and 120 lbs. respectively and use a 12 ft. plank for a teeterboard. Tom sits 5 ft. sits 4 ft. and Harry sits 3 ft. from the fulcrum on the same side. The fulcrum is at the midpoint of the board. How far must a 200-pound friend sit from the fulcrum to balance them?

    When I read this problem, I thought it would be easy. But, I have done this over and over and can't get the right answer. :rolleyes:
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jun 2, 2008, 04:00 PM
    You have two people listed, but three weights.?

    Moment is distance times weight.

    5(50)+4(85)+3(120)=200x

    Solve for x.

    That is how far from the fulcrum the friend should sit.
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