A certain Xinhua bookstore sold 6,000 sixth-grade math tutoring books, 1/5 of the total sold on the first day, more than 1/3 sold on the second day, and the rest were sold out on the third day. How many copies did you sell on the third day?
某新华书店卖出六年级数学辅导用书6000本，第一天卖出总数的(1/5)，比第二天卖出的多(1/3)，剩下的第三天卖完．第三天卖出多少本？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">6_000 * (1/5)</gadget>
<output>1_200</output>

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

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(1/5) / (4/3)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">6_000 * (3/20)</gadget>
<output>900</output>

<gadget id="calculator">6_000 - 1_200 - 900</gadget>
<output>3_900</output>

<result>3_900</result>