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11 September, 20:21

The sum of three numbers is 51. the second number is 2 times the third. the third number is 9 more than the first. what are the numbers?

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  1. 11 September, 22:34
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    X+y+z=51

    y=2z

    z=9+x

    subsitute those

    x+2z+9+x=51

    x+2 (9+x) + 9+x=51

    x+18+2x+9+x=51

    4x+27=51

    minus 27 both sides

    4x=24

    divide by 4

    x=6

    sub back

    z=9+x

    z=9+6

    z=15

    y=2z

    y=2 (15)

    y=30

    the numbers are

    6,30,15
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