x:y=6:5
x=1.2y
(x+180):(y+30)=18:11
11(x+180)=18(y+30)
11(1.2y+180)=18(y+30)
13.2y+1980=18y+540
18y-13.2y=1980-540
4.8y=1440
y=300
x=1.2x300=360
如果本题有什么不明白可以追问,