Răspunsuri

2014-02-20T23:22:32+02:00
I zi -35% x
      rest r1= 65% x
II zi- 80%r1
      rest r2=20% r1
III zi- r2=260 km
260 km =20% din r1
rezulta ca r1= 260*100/20=260*5=1300 km
r1=1300 km =65%x
x=1300*100/65=2000 km
2014-02-21T00:38:45+02:00
Fie x = distanta ce trebuia parcursa
In prima zi a parcurs 35x/100
Au ramas de parcurs dupa prima zi 65x/100
In a doua zi a parcurs (80/100)·(65/100)·x=52x/100
Distanata de parcurs este deci
x=35x/100+52x/100+260
100x=87x+26000
13x=26000
x=2000 km