During the summer vacation, the school plans to use square bricks to pave the corridor. If you use square bricks with a side length of 3 decimeters, you need 480 bricks. If you use square bricks with a side length of 40 cm, how many bricks are needed at least? (Solve with ratio)
暑假期间，学校准备用方砖铺走廊，如果用边长是3分米的方砖，需要480块，如果用边长是40厘米的方砖，则至少需要多少块？(用比例解)
<gadget id="calculator">3 * 3 * 480</gadget>
<output>4_320</output>

<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4_320 / 16</gadget>
<output>270</output>

<result>270</result>