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80g - 100%
x - 5%
x=80*5/100=4g - masa soli w naszej solance
masa roztworu drugiego 80g + 20g =100g
100g - 100%
4g - x
x=100*4/100=4%
Odp. Stezenie solanki po dolaniu 20g wody wynosi 4%