Question 566216
each cube volume 8 cu.inches
total volume is 80 cu.in.

hence the volume of the box should be at least 80 cu.in

cube rooting 80 we will get 4 < 80^(1/3) < 5

we cannot have 4 and a fraction for a side in the cube .

so we take 5 as the box side

so the box size is minimum of 5 inches


cheers