A conference hall needs to be paved with square bricks, and the square bricks with a side length of 3 decimeters need to use 960 pieces. If the square bricks with a side length of 4 decimeters are used instead, how many pieces are needed? (Solve with ratio)
一间会议大厅要用方砖铺地，用边长是3分米的方砖，需用960块，如果改用边长是4分米的方砖，需用多少块？(用比例解)
<gadget id="calculator">3 * 3 * 960</gadget>
<output>8_640</output>

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

<gadget id="calculator">8_640 / 16</gadget>
<output>540</output>

<result>540</result>