ms1=300g
c1=20%
ms2=200g
c2=10%
c=5%
[tex]c1 = \frac{md1}{ms1} \times 100[/tex]
[tex]md1 = \frac{c1 \times ms1}{100} = \frac{20 \times 300}{100} = 60g[/tex]
[tex]c2 = \frac{md2}{ms2}\times 100 [/tex]
[tex]md2 = \frac{c2 \times ms2}{100} = \frac{10 \times 200}{100} = 20g[/tex]
md=md1+md2=60+20=80g
ms=ms1+ms2=300+200=500g
[tex]c = \frac{md}{ms + m \: apa} \times 100[/tex]
c ×(ms+m apă)=md×100
c×ms+c×m apă=md×100
c×m apă = md×100-c×ms
[tex]m \: apa = \frac{md \times 100 - c \times ms}{c} [/tex]
[tex]m \: apa = \frac{80 \times 100 - 5 \times 500}{5} = \frac{8000 - 2500}{5} [/tex]
[tex]m \: apa = \frac{5500}{5} = 1100[/tex]
