The length of the bathroom is $10 \frac{1}{2}$ feet and each tile is $1 \frac{1}{2}$ feet. So, we divide the length of the bathroom by the length of the tile.
\[ \frac{10 \frac{1}{2}}{1 \frac{1}{2}} = \frac{21}{2} \div \frac{3}{2} = \frac{21}{2} \times
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