Question

Ms1=400g
c1=20%
Ms2=200g
c2=60%
Cf=?

Answer 1

c1 = md*100/ ms 1
20 = md *100/ 400
md = 400*20/100
md 1 = 80g

c2=60%
ms 2 = 200
md2= c2*ms 2/100
md 2 = 60*200/100
md 2= 120 g
 
c final= (md1+md2) * 100/ (ms1+ms2)
c final =( 80 + 120) *100/ (200+400)
c final = 200*100 / 600
c final = 33,33%

Answer 2

md1 = 20 * 400 =  80g
             100

md2 = 200 * 60 = 120 g
            100

mdf = 80 + 120 = 200g
msf = 400 + 200 = 800g
cf = 200 * 100 = 25 g
       800