An engineering team wants to build a road with a total length of 3.3 kilometers, and 1.2 kilometers have been repaired in the first 3 days. In the future, due to the transfer of workers to participate in other projects, 100 meters will be repaired less every day. How many days will it take to complete this road?
一支工程队要修一条公路，全长3.3千米，前3天已经修了1.2千米．以后由于抽调工人参加另外工程，每天少修100米，修完这条路还要几天？
<gadget id="calculator">3.3 - 1.2</gadget>
<output>2.1</output>

<gadget id="calculator">1.2 / 3</gadget>
<output>0.4</output>

<gadget id="calculator">100 / 1_000</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">0.4 - (1/10)</gadget>
<output>0.3</output>

<gadget id="calculator">2.1 / 0.3</gadget>
<output>7</output>

<result>7</result>