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400g-5%
x -100%
x=8000g
8000g-400g=7600g
Odp: Należy zmieszać 7600g wody.
ms= 400g soli
Cp= 5%
szukane
mr=?
cp=ms/mr *100% //100%
mr= ms*100% / cp
mr= 400 g * 100% / 5 %
mr= 8000g
m wody= mr-ms
m wody= 8000g -400g
m wody= 7 600 g