If the school uses bricks to pave a rectangular aisle, it needs 2160 pieces of square bricks with a side length of 0.3 meters; if it uses bricks with a length of 0.4 meters and a width of 0.3 meters, how many pieces are needed? (Solve with ratio)
学校用砖铺一条长方形走道，用边长是0.3米的方砖铺，需要2160块；如改用长是0.4米、宽是0.3米的砖铺，需要多少块？(用比例解)
<gadget id="calculator">0.3 ** 2</gadget>
<output>0.09</output>

<gadget id="calculator">0.09 * 2_160</gadget>
<output>194.4</output>

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

<gadget id="calculator">194.4 / 0.12</gadget>
<output>1_620</output>

<result>1_620</result>