In a city in 2009, there were 112 days with "excellent" air quality, and the number of days with "good" air quality was twice the number of days with "excellent". The rest of the air quality is "slightly polluted". How many days in the last year did the city have "slightly polluted" air quality?
某城市2009年空气质量为"优"的有112天，空气质量为"良"的天数是"优"的天数的2倍．其余的空气质量为"轻度污染"．这个城市去年有多少天的空气质量为"轻度污染"？
<gadget id="calculator">112 * 2</gadget>
<output>224</output>

<gadget id="calculator">365 - 112 - 224</gadget>
<output>29</output>

<result>29</result>