A movie theater has 868 seats downstairs, and the upstairs seats are downstairs (9/14). How many fewer seats are upstairs than downstairs?
某影剧院楼下有868个座位，楼上的座位是楼下的(9/14)，楼上的座位比楼下少多少个？
<gadget id="calculator">9 / 14</gadget>
<output>9/14 = around 0.642857</output>

<gadget id="calculator">868 * (9/14)</gadget>
<output>558</output>

<gadget id="calculator">868 - 558</gadget>
<output>310</output>

<result>310</result>