Răspuns :
masa solutiei = m H2O + masa dizolvata
C%=(md/ms)*100=>md = (c*ms)/100
=>100md=c*ms=>100md=25*(mH2O + md)
=>100md=25*150 + 25md=>75md=3750=>md=50 g zahar
C%=(md/ms)*100=>md = (c*ms)/100
=>100md=c*ms=>100md=25*(mH2O + md)
=>100md=25*150 + 25md=>75md=3750=>md=50 g zahar
100md=c(md+mapă)
100md=25(md+150)
100md=25md+3750
75md=3750
md=50 g de zahar
100md=25(md+150)
100md=25md+3750
75md=3750
md=50 g de zahar