Ray's weight is 3 times the weight of his sister. His dad weighs twice as much as Ray. Their total weight is 400 pounds. How much does each person weigh?

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  1. What does this problem teach you about physics? Nothing.

    Use algebra.
    R = Ray's weight
    S = Sis' weight
    D = Dad's weight

    R = 3S
    D = 2R = 6S

    S + 3S + 6S = 10S = 400

    Take it from there.

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