___ is the number of cubes [rooms] on each floor. [Enter a numerical value]

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Solution

Since, on each floor, there are 3 by 3 cubes [rooms], this means, there are 3 $\times$ 3 = $3^{2}$ = 9 cubes [rooms].

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___ is the number of cubes [rooms] on each floor. [Enter a numerical value]

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Since, on each floor, there are 3 by 3 cubes [rooms], this means, there are 3 $\times$ 3 = $3^{2}$ = 9 cubes [rooms].