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c=25%
ma=8kg
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md=? sare
-----------------


Răspuns :

c=md/ms

=>md=c·ms

ms=md+ma

md=c(md+ma)
md=25/100 ·(md+8kg)
md=md/4 +8kg/4
md - md/4=2kg
3md/4=2kg
md=2kg :3/4
md=2kg ×4/3
md=8kg/3
md=2,(6) (kg sare)