Question

ma=500g
c=30%

md=?

am incercat aa o rezolv dar nu mi a dat exact

Answer 1

m.apa = 500 g

c% sol = 30%

stim ca c% = mdx100/ms

si mai stim ca ms = md + 500

=> 30 = mdx100/(md+500)

=> 30(md+500) = 100md

=> md = 15000/70 = 214,3 g

facem proba:

ms = 714,3 g

md = 214,3

=> c = 214,3x100/714,3 = 30% deci verifica

scuze de confuzie.......