Răspuns :
I----------I--------------------------I a+240
I----------I a
I----------I---------I----------I-------------------------I 3a+240
3a+240=480
a=80
80+240=320
verificare
320+2x80=480
Cu mare placere!
I----------I a
I----------I---------I----------I-------------------------I 3a+240
3a+240=480
a=80
80+240=320
verificare
320+2x80=480
Cu mare placere!