suma w+p+k=0,6+1,2+2,4=4,2
piasek stanowi (1,2*100)/4.2=28,57% całości czyli 2/7
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suma w+p+k=0,6+1,2+2,4=4,2
piasek stanowi (1,2*100)/4.2=28,57% całości czyli 2/7