Question

Se amesteca 50 g de sirop de concentratie 10% cu 200 g de solutie de sirop de concentratie 30% . Care este concentratia solutiilor obtinute prin amestecarea celor 2 solutii . ?

Answer 1

~ms1=50g; c1=10%; ms2=200g; c2=30%.......c3=?
~50g.....md1
  100g....10g     
=> md1=(50*10)\100=5g
~200g...md2
  100g...30g
=>md2=(200*30)/100=60g
~ms3=ms1+ms2=250g
  md3=md1+md2=65g
~250g.....65g
  100g.....c3
=>c3=(100*65)/250=26g

Am facut cu regula de 3 simpla si am pus "~" ca ii altceva, adica alt rand