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O turma de antilope migreaza intr-o zi astfel: dimineata parcurge 2/3 din drum si inca 15 km,la amiaza 40% din rest ,iar seara ultimii 27 km.Aflati lungimea drumului parcurs de turma.


Răspuns :

x=lungime drum
2x/3 +15 = dimineata
[x-(2x/3+15)]×40%=(x-2x/3-15)×2/5=(x/3-15)×2/5=2x/15-6
2x/3+15+2x/15-6+27=x
2x/3+2x/15+36=x
10x+2x+540=15x
3x=540
x=180 km