Susan made a block with small cubes of 7 cubic cm volume to make a block 4 small cubes long,
4 small cubes wide and 10 small cubes deep. She realises that she has used more small cubes than she really needed.
She realised that she could have glued a fewer number of cubes together to look like a block with same dimensions,
if it were made hollow. What is the minimum number of cubes that she needs to make the block?

160
32
128
79

• (4*4*10)-((4-2)*(4-2)*(10-2))
  =160-(2*2*8)
  =128
  
• 13 years agoHelpfull: Yes(3) No(1)