Foreign language school decoration multimedia classroom. It is planned to pave the floor with glazed square bricks with a side length of 3 decimeters, and 900 pieces are needed. How many pieces are actually needed to pave the floor with square marbles with an area of 25 decimeters? (Answer with proportional knowledge)?
外语学校装修多媒体教室．计划用边长3分米的釉面方砖铺地，需要900块，实际用面积25平方分米的正方形大理石铺地，需要多少块？(用比例知识解答)？
<gadget id="calculator">3 * 3 * 900</gadget>
<output>8_100</output>

<gadget id="calculator">8_100 / 25</gadget>
<output>324</output>

<result>324</result>