Răspuns :
945-756=189(c)
289-189=100(v)
945-289=656(o)
v:189+100+656=945
289-189=100(v)
945-289=656(o)
v:189+100+656=945
c + o + v = 945
c + o = 756
c + v = 289
v = 945 - 756 = 189
o = 945 - 289 = 656
c = 945 - ( 189 - 656 ) =
c = 945 - 845 = 100