A conference room is paved with square bricks. If it is paved with square bricks with a side length of 0.3m, it needs 720 pieces. Now you want to use square bricks with a side length of 6dm. How many pieces are needed?
一间会议室用方砖铺地面，如果用边长为0.3m的方砖铺需720块，现想改用边长为6dm的方砖铺，需要多少块？
<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) * (3/5)</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">720 / (9/25)</gadget>
<output>2_000</output>

<gadget id="calculator">0.3 * 0.3 * 2_000</gadget>
<output>180</output>

<result>180</result>