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1,6 *3,6 + 0,7 * 4,2 = 5,76 +2,94 = 8,70 zł
Pani Nakielska
0,4*4,50 = 1,80
8,70-1,80= 6,9 ---> koszt arbuza
6,9 : 2,3= 3
Arbuz ważył 3 kilogramy