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300g - 100%
x - 10%
x= 300g * 10% /100% = 30g
400g - 100%
30g - x
x= 30g * 100% /400g = 7,5%
odp. 7,5%
do 250g 5% roztworu soli kuchennej dodano 100 s soli oblicz cp
250g - 100%
x - 5%
x= 5% * 250g /100% = 12,5g
350g - 100%
112,5g - x
x= 112,5g * 100% / 350g = 32%
odp okolo 32%
ile gramów cukru potrzeba do przygotowania 250 g roztworu o stężeniu 10 %.
250g - 100%
x - 10%
x = 250g * 10% / 100% = 25g
odp.25g