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1/20*18=0,9dag=9g
1/20 *18dag = 0,9dag
0,9dag = 9g
19/20 - x
20/20 * x = 19/20 * 18 = 171/10 = 17,1
18 - 17,1 = 0,9 dag = 9g
Odp: Inne substańcje w organiźmnie meduzy ważą 9g