Răspuns:
ms=240g
c=15%
c1=10%
_________
md=?
mapa1=?
c=md*100/ms
md=c*ms/100
md=15*240/100=36 g sare
c1=md*100/ms1
ms1= ms+mapa1
10=36*100/ms1=> ms1=3600/10= 360 g solutie
360=240+mapa1=> mapa1=360-240=120 g apa
