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2014-02-24T17:15:05+02:00
7/10⇒a mers mugarul
10/10⇒intregul
10/10-7/10=3/10=12km
3/10 din 12km= 12km : 3= 4km= 1/10
7/10= 4km x 7= 28km (a mers mugarul)
28km+12km=40km (are drumul)
15 4 15