Tabletka musujca Provit o masie 4200 mg zawiera 30 mg witaminy C. Ile mg witaminy C zawiera tabletka Provit o masie 1 g ? Wynik zaokrąglij do 1mg.
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1g=1000mg
4200-30
1000-x
x=30000/4200
x=(około)7,14
1g=1000mg
4200mg - 30mg
1000mg - xmg
x=1000mg*30mg:4200mg=≈7,14mg=≈7mg