To build a road, the original plan was to build 0.45km per day, and it was completed in 30 days. In fact, an extra 0.05km was repaired per day. How many days will it take to complete the repair?
修一条公路，原计划每天修0.45km，30天修完，实际每天多修0.05km，修完需要多少天？
<gadget id="calculator">0.45 + 0.05</gadget>
<output>0.5</output>

<gadget id="calculator">30 / 0.5</gadget>
<output>60</output>

<gadget id="calculator">0.45 * 60</gadget>
<output>27</output>

<result>27</result>