If you use square bricks with an area of 9 square decimeters to pave the floor, you need 960 square bricks. If you use square bricks with a side length of 4 decimeters instead, how many square bricks are needed? (Answer with the knowledge of proportion)
用面积是9平方分米的方砖铺地，需要方砖960块，如果改用边长是4分米的方砖铺地，需要方砖多少块？(用比例的知识解答)
<gadget id="calculator">9 * 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>