If you use rectangular floor tiles with a length of 4 decimeters and a width of 3 decimeters to pave a living room, 240 tiles are exactly covered and there is no excess. If it is changed to a square floor tile with a side length of 3 decimeters, how many tiles will be used to cover it completely?
用长4分米、宽3分米的长方形地砖铺一间客厅，240块正好铺满且没有多余，如果改为边长3分米的正方形地砖，要用多少块才能铺满？
<gadget id="calculator">3 * 4 * 240</gadget>
<output>2_880</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">2_880 / 9</gadget>
<output>320</output>

<result>320</result>