1.6=x-y
7.4=0.25x+0.1y
x=1.6+y
7.4=0.25(1.6+y)+0.1y
7.4=0.4+0.25y+0.1y
7.4=0.4+0.35y
y=7.4-0.4/0.35
y=20
x=20+1.6=21.6
1.6=x-y
7.4=0.25x+0.1y
x=1.6+y
7.4=0.25(1.6+y)+0.1y
7.4=0.4+0.25y+0.1y
7.4=0.4+0.35y
y=7.4-0.4/0.35
y=20
x=20+1.6=21.6