primul album I.....I.................+62..........I
al doilea album I.....I.....I.....I.....I.....I..+42..I
care este diferenta dintre timbrele luate din cele 2 albume?
62-42=20
cate timbre au ramas in primul album ?
20:4=5 timbre
cate timbre au ramas in al doilea album ?
5*5=25 timbre