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y=masa roztworu 60%
0.3*x+0.6*y=0.4*200
x+y=200
0.3x+0.6y=80/*10
x+y=200/*-3
3x+6y=800
-3x-3y=-600
3y=200
y=66.67
x+y=200
x+66.67=200
x=133.33
odp nalezy dodac 133.33g roztworu 30% i 66.66g roztworu 60%