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x+ y=200
0.12x+ 0.02y=6
x+y=200
x= 200-y
0.12× (200-y) + 0.02y=6
24-0.12y+0.02y=6
-0.1y=-18
y=180
x+y=200
x=200-180
x=20
x=20
y=180