Question

ms1=1kg c1=80% + c2=20% => cf=40% ms2=?

Answer 1

md1=ms1*c1=1*80/100=0,8kg

md2=ms2*20/100=0,2xms2

cf=(md1+md2) /(ms1+ms2)=40%

(0,8+0,2xms2) / (1+ms2) =0,4

0,8+0,2xms2=0,4+0,4ms2

0,2xms=0,4

ms=2 kg