Tolong dong kakak.no 7&8.

1)
40+3x+30+x+6x=180
70+10x=180
10x=110
x=11

2)A=0,5C B=1,5A

A+B+C=180
A+1,5A+2A=180
4,5A=180
A=40

B=1,5(A)
B=1,5(40)
B=60
A=0,5C
40=0,5 . c
80=c