The movie theater pre-sells movie tickets 3 days in advance, (1/4) of all movie tickets are sold on the first day, and (1/3) of all movie tickets are sold on the second day. How many movie tickets are left to sell?
电影院提前3天预售电影票，第一天售出全部电影票的(1/4)，第二天售出全部电影票的(1/3)，如果电影院共有1200个座位，第三天还剩多少张电影票可售？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/4) - (1/3)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1_200 * (5/12)</gadget>
<output>500</output>

<result>500</result>