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0,94x+0,8y=0,87*100
y=100-x
0,94x+0,8(100-x)=87
y=100-x
0,94x+80-0,8x=87
y=100-x
0,14x=7
x=50
y=50
Odp. Należy stopić po 50g z obydwu prób.