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400----100%
36------x
x=36*100/400=9%
b)
10 ml = 0.01 l = 0,01 kg = 10 g
10 g + 0,73 =10,73 masa roztworu
10,73-----100%
0,73-------z
z=100*0,73/10,73 = 6,8 % stezenie roztworu