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Un calator parcurge o distanta astfel: in prima zi 20%din total,a doua zi 50% din total,iar in a treia zi,ii ramane de parcurs 60 km.Ce distanta a parcurs?
Dau coroana.


Răspuns :

100%-(20%+50%)=30%=60KM.
30%x3=90%=30x3=90km.
100%-90%=10%?
10%=30%;3=60;3=20km
90km+20km=110km
In total calatorul a parcurs 140 de km