Internal length =30cm,
breadth =24cm
and height of a box =15cm
Edge of each cube is 3cm
Number of cubes which can be placed along length =303=10
No. of cubes along the breadth =243=8,
and no. of cubes along the height =153=5
No of cubes
N=(10×8×5)
N=400
Hence, the number of cubes =400