The 12th National Games will be held in Liaoning from August 31 to September 12, 2013. How much of the total number of days in September will the number of days of this National Games be?
第十二届全运会于2013年8月31日至9月12日在辽宁举行，本届全运会历时天数占九月份总天数的多少．
<gadget id="calculator">13 / 30</gadget>
<output>13/30 = around 0.433333</output>

<result>13/30 = around 0.433333</result>