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Ce masa de substanta pura se gasesc in 1,5 tone de calcar cu puritate 90%?



Răspuns :

puritatea=masa pura/masa impura(totala)*100
masa pura = puritatea * masa impura / 100
masa pura = 90*1,5/100=>masa pura = 1,35 tone 
90/100*1,5=1,35 tone =1350 kg substanta pura