VA ROOG! Prin introducerea a X grame sare de bucatarie in 900g solutie de concentratie 10%, se obtine o noua solutie cu concentratia 14,5%. Ce valoare are X? Multumesc!
c = md*100/ms md1 = 10*900/100 = 90 g sare md2 = md1 + x = 90+x ms2 = ms1 + x = 900+x 14,5 = (90+x)*100/(900+x) 9000+100x = 13050+14,5x 85,5x = 4050 x = 47,36 g sare
