3. Smitha was making a cub with dimensions 5*5*5 using 1*1*1 cubes. What is the number of cubes needed to make a hollow cube looking of the same shape? a) 98 b) 104 c) 100 d) 61

• ans.a
  5*5*5-(5-2)*(5-2)*(5-2)=98
• 12 years agoHelpfull: Yes(2) No(3)
• ans :: a)98
  
  (5*5*5 - 3*3*3)/(1*1*1) = 98
• 11 years agoHelpfull: Yes(2) No(0)
• here we want to make hollow cube one face of the cube required 25 cubes
  cube has six faces means
  1st face 25 cubes
  2faces of 20 cubes=40 cubes
  2 faces of 15 cubes =30 cubes
  remaining 1 face =9 cubes
  to make 5*5*5 of hollow cube using 1*1*1 we required 104 cubes
• 12 years agoHelpfull: Yes(0) No(5)