Odpowiedzi

2010-03-08T19:27:18+01:00

5%-x(sol)
100%-80g(woda i sol)
x=(5%*80g)/100%
x=4g
80g-4g=76g
76g+20g=96g
4g+96g=100g

4g-x%
100g-100%
x=4g*100%/100g
x=4%