①0.2/1.5=(x-4)/6
1.5*(x-4)=0.2*6
1.5x-6=1.2
1.5x=7.2
x=4.8
②1/3 :2/5 = 3/4 :(7- x)
1/3*(7- x)=2/5*3/4
7/3-1/3* x=3/10
1/3* x=61/30
x=6.1
①0.2/1.5=(x-4)/6
1.5*(x-4)=0.2*6
1.5x-6=1.2
1.5x=7.2
x=4.8
②1/3 :2/5 = 3/4 :(7- x)
1/3*(7- x)=2/5*3/4
7/3-1/3* x=3/10
1/3* x=61/30
x=6.1