Răspuns :
5+10 +15+20+25+30+35+40=160
Verificare:
5+15=20
25+35=60
10+20+30+40+60=
30+30+40+60=
60+40+60=
100+60=
160
Verificare:
5+15=20
25+35=60
10+20+30+40+60=
30+30+40+60=
60+40+60=
100+60=
160