a.I____I120I b.I____I c.I____I120I60I Suma lor este 5940 deci facem suma partilor cunoscute : 120+120+60=300 (s.p.c.) 5.940-300=5.640 ( suma partilor egale) 5.640:3=1.880 (nr. b ) 1880+120=2.000( nr. a) 1880+120+60=2.060 (nr. c ) Verificare : 1.880+2.000+2.060=5.940