A tent factory in Zhejiang plans to produce 450 tents in the first half of the year. In order to support the disaster area, 1800 pieces were produced in the second half of the year. How much more cans are produced per month on average in the second half of the year than in the first half?
浙江某帐篷厂计划上半年生产帐篷450顶．为了支援灾区，下半年生产了1800顶．下半年比上半年平均每月多生产多少顶？
<gadget id="calculator">1_800 - 450</gadget>
<output>1_350</output>

<gadget id="calculator">1_350 / 6</gadget>
<output>225</output>

<result>225</result>