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10-x - ilość solanki 1%
0,05x+0,01(10-x)=0,04*10
0,05x+0,1-0,01x=0,4
0,04x=0,4-0,1
0,04x=0,3 /:0,04
x=7,5 kg solanki5%
10-7,5 =2,5 kg solanki 1%