Answer :
what you need is the total volume of the two boxes
V = H*L*W
small box = 384 inches cubed
big box = 2700 inches cubed
the difference is the space you have left... Here, that is 2700 - 384 = 2316 inches cubed
V = H*L*W
small box = 384 inches cubed
big box = 2700 inches cubed
the difference is the space you have left... Here, that is 2700 - 384 = 2316 inches cubed