A b o y want s t o make c ub o ids o f dime nsio n 5 m, 6m & 7 m fr o m small c ub e s o f . 0 3 m^3 . Lat e r he r e alize d t hat he
c an make so me c ub o ids b y making it ho llo w. The n it t ake s so me c ub e s le ss. What is t he number of cube to be removes?

• total no of cubes = 5*6*7 = 210
  and each cube contain volume = 0.03m^3
  no of hollow cubes = (5-2)*(6-2)*(7-2)/0.03 = 2000
  so no of cubes removed = 7000-2000= 5000 ans
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