5*0,09=0,45
15*0,18=2,7
2,7+0,45=3,15
20--100%
3,15--x%
x=(3,15*100)/20=15,75
0dp. Stężenie wynosi 15,75% .
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5*0,09=0,45
15*0,18=2,7
2,7+0,45=3,15
20--100%
3,15--x%
x=(3,15*100)/20=15,75
0dp. Stężenie wynosi 15,75% .