An auditorium needs to pave the floor with granite slabs, and the slabs with a side length of 3 decimeters need 9600 yuan. If you switch to a board with an area of 16 square decimeters, how many pieces are needed? (Solve with ratio)
某礼堂要用花岗岩板材铺地，用边长是3分米的板材铺，需要9600块．如果改用面积是16平方分米的板材铺，需要多少块？(用比例解)
<gadget id="calculator">3 * 3 * 9_600</gadget>
<output>86_400</output>

<gadget id="calculator">86_400 / 16</gadget>
<output>5_400</output>

<result>5_400</result>