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A) 2kg i 50 dag.
50dag=0,5kg
2:0,5 = 4:1
B) 0,5 h i 20 min
20min=0,2h
0,5:0,2 = 5:2
C) 0,1km i 250 m
0,1km=100m
100:250 = 2:5