Răspuns :

Răspuns:

c= mdx100/ms

ms1=30g

c1=30%

md1= c1xms1/100= 30x30/100g=9g

ms2=40g

c2=40%

md2= c2xms2/100= 40x40/100g=16g

c3 =md3x100/ms3   unde   md3=md1+md2+md= 9+16+30=>55g

                                              ms3=ms1+ms2+md= 30+40 +30=> 100g

c3=55x100/100=55%

Explicație: