During the summer vacation, the school plans to use square bricks to pave the corridor. If square bricks with an area of 9 square decimeters are used, 480 bricks are needed. If square bricks with an area of 16 square decimeters are used, how many bricks are needed at least? (Solve with ratio)
暑假期间，学校准备用方砖铺走廊，如果用面积是9平方分米的方砖，需要480块，如果用面积是16平方分米的方砖，则至少需要多少块？(用比例解)
<gadget id="calculator">480 * 9</gadget>
<output>4_320</output>

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

<result>270</result>