The chicken farm sells a batch of broilers. The first time it sells (2/5) of the total number of broilers, and the second time it sells (1/3) of the total number of broilers. There are 1200 broilers left. How many broilers are there in the chicken farm? ?
养鸡场卖出一批肉鸡，第一次卖出肉鸡总数的(2/5)，第二次卖出肉鸡总数的(1/3)，还剩肉鸡1200只，鸡场有肉鸡共多少只？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1_200 / (4/15)</gadget>
<output>4_500</output>

<result>4_500</result>