a.I______I+247+187
b.I______I+187
c.I______I+247
Suma este 4567.
247+187+187+247=868
4567-868=3699 ( suma partilor egale )
3699:3=1233 ( o parte egala )
1233+247=1480 ( numarul c )
1233+187=1420 ( numarul b )
1233+247+187=1667 ( numarul a )
Verificare : 1667+1420+1480=4567