A computer store of a certain brand sold an average of 210 computers per quarter in 2014, of which 160, 210, and 220 were sold in the first, second, and fourth quarters respectively. How many computers did you sell in the third quarter?
某品牌电脑专卖店2014年平均每季度销售电脑210台，其中第一、二、四季度分别销售160台、210台、220台．第三季度销售电脑多少台？
<gadget id="calculator">210 * 4</gadget>
<output>840</output>

<gadget id="calculator">160 + 210 + 220</gadget>
<output>590</output>

<gadget id="calculator">840 - 590</gadget>
<output>250</output>

<result>250</result>