Răspuns :
a=becuri roşi
b=becuri galbene
c=becuri verzi
a+b+c=60
b+c=35
a+c=45
a+b+c=60
a+35=60
a=60-35
a=25
a+c=45
25+c=45
c=45-25
c=20
b+c=35
b+20=35
b=35-20
b=15
Verificare:25+20+15=45+15=60
Sper ca te-am ajutat
a=becuri roşi
b=becuri galbene
c=becuri verzi
a+b+c=60
b+c=35
a+c=45
a+b+c=60
a+35=60
a=60-35
a=25
a+c=45
25+c=45
c=45-25
c=20
b+c=35
b+20=35
b=35-20
b=15
Verificare:25+20+15=45+15=60
Sper ca te-am ajutat