Answer:
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
