Un automobil a parcurs o distanta in 3 zile in prima zi a parcurs 35 % din drum , a doua zi a parcurs 20% din rest, iar a treia zi 642 km . Cati km are distanta ?cat a parcurs in a doua zi ?
Notam a -traseul Cat a parcurs prima zi? 35/100 *a =7a/20 Rest:a - 7a/20= 20a/20-7a/20=13a/20 A doua zi: 20/100 din 13a/20=20/100*13a/20=13a/100 REST sau A 3 ZI. 13a/20-13a/100=65a/100 =>65a/100=642km
