A sidewalk surface is 27 meters long and 1.8 meters wide, and it is paved with square floor tiles with a side length of 3 decimeters. At least how many such floor tiles are needed?
一条人行道路面，长27米，宽1.8米，用边长3分米的正方形地砖铺路，至少需要多少块这样的地砖？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * (3/10)</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">1.8 / (9/100)</gadget>
<output>20</output>

<gadget id="calculator">27 * 20</gadget>
<output>540</output>

<result>540</result>