Use 30 cm long and 20 cm wide floor tiles to lay a square, at least how many such floor tiles are needed
用长30厘米、宽20厘米的地板砖铺成一个正方形，至少需要这样的地板砖多少块
<gadget id="calculator">2 * 5 * 3 * 2</gadget>
<output>60</output>

<gadget id="calculator">60 / 30</gadget>
<output>2</output>

<gadget id="calculator">60 / 20</gadget>
<output>3</output>

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

<result>6</result>