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{5%x+20%y=10%*600
0,05x+0,2y=0,1*600
0,05x+0,2y=60 / *(-5)
-0,25x-y=-300
{x+y=600
{-0,25x-y=-300
+_____________
0,75x=300
x=400
y=600-x
y=600-400
y=200
{x=400
{y=200
5%x+20%y=10%*600
x+y=600|*(-0,2)
0,05x+0,2y=60
-0,2x-0,2y=-120
0,05x+0,2y=60
-0,15x=-60
x=400
400+y=600
y=600-400
y=200