susan made a block with small cube of 8cubic cm volume to make a block 3small cubes long,9small cube wide and 5 small cube deep.she realize that she has use more small cubes than she really needed .she realize that she could haave glude a fewer member of cubes together to lock like a block with same dimensions,if it were made hollow.what is the minium number of cubes that she need to make the block
a-114
b-135
c-21
d-71

• as the lenght,breath n ht. of bigger cube is related to small cube.so side of small cube is not relavent.hence....
  no of small cubes req. 4r solid cube= 9*5*3=135
  no of cubes if we take off them req. to make it hollow= (9-2)*(5-2)*(3-2)=21
  hence minimum no of cubes =135-21=114
  
  
  
  
  
  
  
  
  
• 13 years agoHelpfull: Yes(7) No(1)
• given l,b,h of small cube is 2,2,2.
  and volume of large cube is 9x5x3.
  _______
  | ___ |
  | | | |
  |_|_7_|_|
  |_|___|_|
  1 7 1
  so if we remove 2 cubes from each side we can get the volume of hollow cube i.e 7x3x1
  so no. of cubes required is (9x5x3-7x3x1)
• 13 years agoHelpfull: Yes(3) No(0)
• 114
  9*5*3-7*3*1
• 13 years agoHelpfull: Yes(1) No(1)