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masa cz: (23x2)+32+(4x16)+(10x18)=48+32+64+180=324g
masa samej wody: 18x10=180g
180/324 x 100%=55,6%
b)
masa cz:40+(2x35,5)+(6x18)=219g
masa samej wody: 6x18=108g
108/219 x 100%=49,3%