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0,45+y=0,9+0,1y
0,9y=0,45
y=0,5 kg :)
5%*9+x=10%(9+x)
0,05*9+x=0,1(9+x)
0,45+x=0,9+0,1x
x-0,1x=0,9-0,45
0,9x=0,45
x=0,5
odp: Należy dosypać 0,5kg soli.