Lay floor tiles for a classroom with a length of 9 meters and a width of 6 meters. If the area of each floor tile is 900C㎡, 600 pieces are needed; if the area of each floor tile is 2500C㎡, how many pieces are needed? (Please use the knowledge of proportion to answer)
给一间长9米、宽6米的教室铺地砖．如果每块地砖的面积是900C㎡，需要600块；如果每块地砖的面积是2500C㎡，则需要多少块？(请用比例的知识解答)
<gadget id="calculator">600 * 900</gadget>
<output>540_000</output>

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

<result>216</result>