I zi : 1000 :4 +50 = 250+50=300 km
restul dupa I zi : 1000-300 =700 km
700:2=350 km in fiecare din urmatoarele 2 zile
l=Luni ; m=marti ; n=miercuri ; j=joi
m=3l
n=5l
j=150
l+j=(m+n):2
l + 150 = (3l+5l):2
l+150 = 8l :2
l+150 = 4l
150=4l-l
150=3l
l=150:3=50 carti (luni)
m= 3 x 50=150 carti (marti)
n= 5 x 50=250 carti (miercuri)
Total = 50 + 150 +250 +150=600 carti in total