A rectangular floor tile is 18 in length and 12 in width. How many tiles are needed to pave a square with this kind of floor tile?
一种长方形地砖长18，宽12，用这种地砖铺正方形，至少需要多少块．
<gadget id="calculator">3 * 2 * 3 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 / 18</gadget>
<output>2</output>

<gadget id="calculator">36 / 12</gadget>
<output>3</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>