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6 May, 04:34

Four times Bruce's age plus two times Sarah's age equals 84. Bruce's age is also three times Sarah's age. how old is Bruce?

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  1. 6 May, 04:46
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    Bruce=x

    sarah=y

    4x+2y=84

    x=3y

    subsitute

    4 (3y) + 2y=84

    12y+2y=84

    14y=84

    divide both sides by 14

    y=6

    sarah=6

    x=3 (y)

    x=3 (6)

    x=18

    bruce=18

    sarah=6
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