/__________________/__________________/
/_________________/....10/
/______/________/ 1 rest
/______/..20/
/__/__/ 2 rest
/__/.30/
30x2+20=80.....jumatate din 1 rest
80x2 =160...primul rest
160+10=170 jumatate din cantitatea vanduta
170 x2=340 kg de grau au fost la inceput