Question

ajutati-ma va rog! Dacă sunt corecte dau coroana!

Answer 1

c = md*100/ms => ms = md*100/c => md = ms*c/100
ms = md + m apă
1)
a) ms = 40+240 = 280 g
c = 40*100/280 = 14,28%
b) ms = 20+160 = 180 g
c = 20*100/180 = 11,11%
2) a) md1 = 300*30/100 = 90 g
md2 = 600*90/100 = 540 g
md3 = md1 + md2 = 90+540 = 630 g
ms3 = ms1+ms2+m apă = 300+600+200 = 1100 g
c3 = 630*100/1100 = 52,72%
b) md1 = 200*40/100 = 80 g
md2 = 400*60/100 = 240 g
md3 = md1+md2 = 80+240 = 320 g
ms3 = ms1+ms2+m apă = 200+400+200 = 800 g soluție
c3 = 320*100/800 = 40%