Question 900882
x+y=900,
2*x+5*y=2700
x=900-y
2*(900-y)+5*y=2700
1800-2y+5*y=2700
3*y=900
y=300
x=900-y
x=600 at 2 and  y=300 at 5
check
600+300=900
2*x+5*y=2700
2*600+5*300=2700
1200+1500=2700
2700=2700
ok