30%: 30 g sub--------100 g r-ru
x g sub--------150 g r-ru
x= 45 g sub
y--- ilość dodanej wody
10%:. 10 g sub--------100 g r-ru
45 g sub-------- (250+y) r-ru
45*100= 10*(250+y)
4500=2500+ 10y
y= 200 g H2O
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30%: 30 g sub--------100 g r-ru
x g sub--------150 g r-ru
x= 45 g sub
y--- ilość dodanej wody
10%:. 10 g sub--------100 g r-ru
45 g sub-------- (250+y) r-ru
45*100= 10*(250+y)
4500=2500+ 10y
y= 200 g H2O