. 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

• ans:a)2000
  solution: volume of the cuboid = 5m * 6 m * 7m = 210 m3
  small cube volume = 0.03 m3
  no. of cubes = 210/.03 = 7000
  and to make hollow we have to remove 3m*4m*5m=60m3 volume
  then no. of cube= (60/.03)=2000
  
  
  
• 12 years agoHelpfull: Yes(12) No(8)
• ans will be 2000
• 13 years agoHelpfull: Yes(10) No(7)
• at 1st 5*6*7/.03=7000
  to make it hollow
  3*4*5/.03=2000
• 13 years agoHelpfull: Yes(6) No(5)
• 5000
• 13 years agoHelpfull: Yes(3) No(17)
• please explain in detail............
• 13 years agoHelpfull: Yes(2) No(2)
• Volume of cobe to be removed = 3*4*5
  = 60
  No of cubes to be removed = 60/.03
  = 2000
• 12 years agoHelpfull: Yes(0) No(1)