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a teraz proporcja
0,7-------x
1-------3,5
x=3,5*0,7=2,45 <- tyle ewa zaplacila za 0,7 dag jabłkek
70 dag=0,7kg
i teraz 8,75-2,45=6,3zł
i znowu proporcja
6,30-------x
4,20------1
x=6,30/4,20=1,5
odp. ewa kupila 1,5 kg sliwek