) 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?

114
135
21
71

• (3*9*5)-((3-2)*(9-2)*(5-2))=114
• 13 years agoHelpfull: Yes(23) No(5)
• vol of larger cube= 3*9*5
  vol of smaller cube=1*7*3
  vol of hollow = v1-v2=ans....
• 13 years agoHelpfull: Yes(13) No(1)
• Each small cube will be of 2 cm side.If we arrange them to make the large one with same dimension,there will be two arrangements 1-for bottom and top face, 2-for three middle arrangements.For base and top if we arrange 3 cubes for length and 9 cubes for width, total will be 27 cubes. for middle arrangements only border cubes will be counted and they will be 20. so total=2*27+3*20=114
• 11 years agoHelpfull: Yes(6) No(0)