A boy wants to make cuboids of dimension 5m, 6m and 7m from small cubes of .03 m3. Later he realized he can make same cuboids by making it hollow. Then it takes some cubes less. What is the number of the cubes to be removed?
a) 2000 b) 5000 c) 3000 d) 7000

• total number of cubes=5*6*7=210
  given volume of each cube =0.03m3
  so no of cubes can be formed is 210/0.03
  no of hollow cubes=(5-2)*(6-2)*(7-2)/0.03=2000
  so no of cubes to be removed is 7000-2000=5000.
• 13 years agoHelpfull: Yes(77) No(9)
• volume of cube= 5*6*7= 210 m3
  volume of small cubes= .03 m3
  volume of hollow cube= 3*4*5=60 m3
  Total required cubes= 210/.03= 7000
  required small cubes of hollow cube= 60/.03=2000
  No of cube which r removed= 7000-2000=5000
• 13 years agoHelpfull: Yes(23) No(8)
• Total volume of cube = 5 * 6 * 7 = 210 m cube
  volume of smaller cube 0.03
  Total cubes reqd = 7000
  for hollow cube no. of small cubes reqd = (5-2)*(6-2)*(7-2)/0.03=2000
  which is approx 2000 so 5000 cubes have to be removed
  So the no. reqd is 5000
• 13 years agoHelpfull: Yes(7) No(8)