To lay floor tiles for a classroom with a length of 9cm and a width of 6cm, if the area of each floor tile is 900cm**2, then 600 pieces are needed; if the area of each floor tile is 2500cm**2, how many floor tiles are needed?
给一间长9cm、宽6cm的教室铺地砖，如果每块地砖的面积是900cm**2，则需要600块；如果每块地砖的面积是2500cm**2，则需要地砖多少块？
<gadget id="calculator">600 * 900</gadget>
<output>540_000</output>

<gadget id="calculator">540_000 / 2_500</gadget>
<output>216</output>

<result>216</result>