SOLUTION:

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Question 209797:
Answer by silencehurts(5) About Me  (Show Source):
You can put this solution on YOUR website!
x+y+Z=180
y=5x
z=2(x+y)
180=x+y+Z
180=x + y + 2(x+y)
180=x + 5x + 2(x+5x)
180= 6x +2x+10x
180=18x
x=10
y=5x=5*10
y=50
z=2(10+50)=2*60
z=120
x+y+Z=180
10+50+120=180
180=180