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25 min. - 1/4 godz
25min. - 1 2/5km : 4
25min. - 7/5 * 1/4
25min - 7/20 km
25min. - 35/100 km
25min. - 0,35 km
2.
pizza
6/10kg - 15zł
1/6kg - ?
36/60kg - 15zł
10/60kg - ?
36/60 / 10/60 = 15/x
36/60x=10/60* 15
36/60x=150/60
0,6x=2,5 /:0,6
x=4,17zł