a+b+c=2450
a=b+250 rezulta ca b=a-250
a=c+180 rezulta ca c=a-180
a l-----l
b l-----l-250 }2450
c l-----l-180
2450+250+180=2880
2880:3=960
a=960
b=960-250
b=710
c=960-180
c=780
proba
960+710
780=2450
SAU
a+a-250+a-180=2450
3a-430=2450
3a=2450+430
3a=2880
a=2880:3
a=960
........