A museum sells 231 tickets on the first day of the holiday, 109 tickets in the morning and 171 tickets in the afternoon on the second day, how many tickets are sold in total in these two days?
某个博物馆在假期第一天卖出231张门票，第二天上午卖出109张门票，下午卖出171张门票，这两天一共卖出多少张门票？
<gadget id="calculator">109 + 171</gadget>
<output>280</output>

<gadget id="calculator">231 + 280</gadget>
<output>511</output>

<result>511</result>