Datele problemei:
ms1=400g
c1=24%
ms2=400g
c2=3%
ms3=?
c3=?
Formula de calcul al concentrației procentuale:
c=md/ms*100
c1=md1/ms1*100
24=md1/400*100=)24/100=md1/400=)md1=24*400/100=)md1=96g
C2=md/ms2*100
3=md2/400*100=)3/100=md2/400=)md2=3*400/100=)md2=12g
md3=md1+md2=)md3=96+12=108
ms3=ms1+ms2=)ms3=400+400=800(am aflat ms3, mai trebuie aflată c3)
c3=md1+md2/ms1+ms2*100
c3=96+12/400+400*100=)c3=108/800*100=)c3=13,5%
