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c=20 % mapa=600g md=? ms=?

Răspuns :

c%=(md/ms)*100
20=(md/md+m apa)*100
md*100=20*md+20*m apa
100md=20md+20*600
100md=20md+12000
100md-20md=12000
80md=12000
md=12000/80
md=150g

ms=md+mapa
ms=150+600
ms=750g