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x= ilość soli
x=3,5%
750+x=100%
...................
100x=3,5(750+x)
100x=2625+3,5x
100x-3,5x=2625
96,5x=2625
x=2625:96,5
x=około 27,2kg soli należy wsypac
g=1000kg/m³
m=g*v
m=1000kg/m³*750m³ = 750 000kg
3,5%=x*100/750000+x |*750 000 + x
2 625 000 + 3,5x=100x
96,5x=2 625 000 |/96,5
x=27 200 kg