To build a canal, the original plan was to build 180 meters per day, and it took 30 days to complete the task. As a result, the task was completed in 27 days. How much more meters were actually built per day than planned?
修一条水渠，原计划每天修180米，30天完成，结果27天就完成了任务，实际每天比计划多修多少米？
<gadget id="calculator">30 / 27</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">180 * (10/9)</gadget>
<output>200</output>

<gadget id="calculator">200 - 180</gadget>
<output>20</output>

<result>20</result>