1)
A=5x
B=4x
C=3x
X=180/(5+4+3)=15
A=75
B=60
C=45
2)
A=X
C=X/3
B=x-20
X+X/3+(x-20)=180 |×3
3x+X+3x-60=540
7x=600
X=85.7=A
B≈28.6
c=65.7
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Answers & Comments
1)
A=5x
B=4x
C=3x
X=180/(5+4+3)=15
A=75
B=60
C=45
2)
A=X
C=X/3
B=x-20
X+X/3+(x-20)=180 |×3
3x+X+3x-60=540
7x=600
X=85.7=A
B≈28.6
c=65.7