How many cubes of edge $2$ cm fit inside a cube of edge $6$ cm?

How many cubes of edge $2$ cm fit inside a cube of edge $6$ cm?
  1. $27$
  2. $9$
  3. $36$
  4. $18$

Solution

$\left(\dfrac{6}{2}\right)^{3} = 27$.

Asked in: IMO

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