An auditorium is paved with granite slabs, and the area is 9dm**2. It needs 9600 pieces. If you switch to a board with an area of 16dm**2, how many pieces will you need? (Solve with ratio)
某礼堂用花岗岩板材铺地，用面积是9dm**2的板材铺．需要9600块，如果改用面积是16dm**2的板材铺，需要多少块？(用比例解)
<gadget id="calculator">9 * 9_600</gadget>
<output>86_400</output>

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

<result>5_400</result>