To pave a piece of land, 720 square bricks with a side length of 0.3 meters are needed. If the square bricks with a side length of 0.4 meters are used instead, how many bricks are needed? (Answer with proportional knowledge)
铺一块地，用边长0.3米的方砖需要720块，如果改用边长0.4米的方砖，需要多少块？(用比例知识解答)
<gadget id="calculator">0.3 ** 2</gadget>
<output>0.09</output>

<gadget id="calculator">0.09 * 720</gadget>
<output>64.8</output>

<gadget id="calculator">0.4 ** 2</gadget>
<output>0.16</output>

<gadget id="calculator">64.8 / 0.16</gadget>
<output>405</output>

<result>405</result>