Use square floor tiles with a side length of 25 cm to pave a road with a length of 20 meters and a width of 2 meters. At least how many such square tiles are needed?
用边长25厘米的正方形地砖铺一条长20米，宽2米的路面，至少需要多少块这样的方砖？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * (1/4)</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">2 / (1/16)</gadget>
<output>32</output>

<gadget id="calculator">20 * 32</gadget>
<output>640</output>

<result>640</result>