Total volume of small boxes= 2*2*2 = 8 cm^3Total volume of large box = 20*10*5 = 1000 cm^3Assuming boxes are manageable and no space among small boxes, total small boxes are required to fill = 1000/8 = 125.but, if we have to fill the large box with small and unchangeable shaped boxes then we canu2019t fill the large box at all. Only 100 small boxes can be managed in the large box. Reason:The length and breath of large box are 20 and 10. Hence, in each 2 cm height of the large box 50 small boxes will be managed. Another 2 cm height 50 more boxes managed. After all 1 cm height of the large box will be empty because of no chance to reshape boxes.