Răspuns :
1 zi=478-126=352,
2 zi=352-279=73,
3 zi=478
In primele 2 zile=425 ochelari,
In total=425+478=903 ochelari
rezolvare: 478-126=352( perechi de ochelari s-au vandut in prima zi)
352-279=73 ( perechi de ochelari in a doua zi)
352+73=425 ( perechi de ochelari in cele doua zile)
425x2=850( perechi de ochelari in total)
352-279=73 ( perechi de ochelari in a doua zi)
352+73=425 ( perechi de ochelari in cele doua zile)
425x2=850( perechi de ochelari in total)