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5%*9+100%x = 10%(9+x)
0,05*9+1*x = 0,1(9+x)
0,45+x = 0,9+0,1x
x-0,1x = 0,9-0,45
0,9x = 0,45 |:0,9
x = 0,5 [kg]
/*100
45+X=10X+90
45=9x /dzielisz to przez 9
5=x
Odp. Należy dosypać 5kg soli.