100gcoacaza.........250mg vitamina
2000g------------------------Xmg vitamina
X=2000*250\100=5000mg vitamine= 5 grame
Daca 100 g coacaza contine 250 mg adica 0,25 grame folosim din nou regula de 3 simpla
100 g coacaza------0,25 g vit
X g coacaza.........0,05 g vit
X=100*0,05\0,25-20 grame
Un adult trebuie sa consume 20 grame coacaza.