It takes 2160 pieces to pave a floor with square bricks with a side length of 0.4 meters. Now it is required to use rectangular floor tiles with a length of 0.4 meters and a width of 0.3 meters. How many pieces are needed? (Solve with ratio)
用边长0.4米的方砖铺一块地需要2160块，现在要求改用长0.4米，宽0.3米的长方形地砖来铺，需要多少块？(用比例解)
<gadget id="calculator">0.4 ** 2</gadget>
<output>0.16</output>

<gadget id="calculator">0.16 * 2_160</gadget>
<output>345.6</output>

<gadget id="calculator">0.4 * 0.3</gadget>
<output>0.12</output>

<gadget id="calculator">345.6 / 0.12</gadget>
<output>2_880</output>

<result>2_880</result>