Răspunsuri

2014-03-30T16:38:55+03:00
Puritatea=masa pura/masa impura(totala)*100
masa pura = puritatea * masa impura / 100
masa pura = 90*1,5/100=>masa pura = 1,35 tone 
2014-03-30T16:39:12+03:00
90/100*1,5=1,35 tone =1350 kg substanta pura