The school computer room plans to use tiles with an area of 9 square decimeters to pave the floor, and it needs 480 tiles. Now it is replaced with tiles with a side length of 4 decimeters. How many tiles are needed? (Solve with ratio)
学校电脑室计划用面积为9平方分米的瓷砖铺地，需480块，现改用边长为4分米的瓷砖铺地，需要多少块？(用比例解)
<gadget id="calculator">9 * 480</gadget>
<output>4_320</output>

<gadget id="calculator">4_320 / 4</gadget>
<output>1_080</output>

<result>1_080</result>