The greening of the campus of the Hui Nationality Primary School required 117 square meters of lawn to be paved, and it took 4.5 days to complete the task. In fact, the task was completed in only 3 days. How many square meters were paved every day more than the plan?
回族小学绿化校园，需要铺草坪117平方米，4.5天铺完，实际只用了3天就完成了任务，实际每天比计划每天多铺多少平方米？
<gadget id="calculator">117 / 3</gadget>
<output>39</output>

<gadget id="calculator">117 / 4.5</gadget>
<output>26</output>

<gadget id="calculator">39 - 26</gadget>
<output>13</output>

<result>13</result>