Susan make a block of small cube of 8 cubic cm

• please give complete question so that we could read properly.
• 6 years agoHelpfull: Yes(0) No(0)
• Susan made a block with small cubes of 8 cubic cm volume to make a block ,3 small cubes long, 9 small cubes wide and 5 small cubes deep. She realizes that she has used more small cubes than she really needed. She realized that she could have glued a fewer number of cubes together to lock 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?
  
  The total volume (in terms of number of cubes) of the solid = 3*9*5 = 135
  The total volume (in terms of number of cubes) of the hollow = (3-2)*(9-2)*(5-2)
  = 21
  so number of cubes required = 135-21 = 114 .
• 5 years agoHelpfull: Yes(0) No(0)