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29 July, 00:17

The sum of three numbers is 129. The third number is 9 less than the first. The second number is 3 times the third. What are the numbers?

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  1. 29 July, 00:32
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    33, 72, and 24

    Step-by-step explanation:

    Let's the three numbers are x, y, and z.

    x + y + z = 129

    z = x - 9

    y = 3z

    Solve the system of equations. Using substitution:

    y = 3 (x - 9)

    y = 3x - 27

    x + (3x - 27) + (x - 9) = 129

    5x - 36 = 129

    5x = 165

    x = 33

    y = 3x - 27

    y = 72

    z = x - 9

    z = 24
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