Question 900317
x+y=300000,
0.1*x+0.085*y=28500
x=300000-y
0.1*(300000-y)+0.085*y=28500
30000-0.1y+0.085*y=28500
-0.015*y=-1500
y=100000
x=300000-y
x=200000
check
0.1*200000+0.085*100000=28500
20000+8500.0=28500
28500.0=28500
ok