Răspuns:
a+b+c=1020
a+x=360
b+x=720
c+x=300
Deci a+x+b+x+c+x=360+720+300
3x+a+b+c=1380
Dar a+b+c=1020
Deci 3x=1380-1020=360
Deci x =360:3=120
a+x=360
a+120=360
a=360-120=240
b+x=720
b+120=720
b=720-120
b=600
c+x=300
c+120=300
c=300-120
c=180
Sper ca te-am ajutat :3
Coroana?plz