|____|---| =100 lei
|______|---| =125 lei a
|________|---| =135 lei |---| -partea adaugata fiecaruia
100-a+125-a+135-a=135 (suma initiala)
360-3a=135
3a=360-135=225
a=225:3= 75 lei suma data fiecaruia
primul copil are
100-75=25 lei
al doilea
125-75= 50 lei
al treilea
135-75= 60 lei
25+50+60=135