chemical fertilizer factory produces a batch of fertilizers, which are shipped out three times. The first shipment (1/3) is 200 tons more than the first shipment, the second shipment is the first (3/5), and the third shipment 450 tons, how many tons of this batch of fertilizers?
一化肥厂生产一批化肥，分三次运出，第一次运出总数的(1/3)还多200吨，第二次运出是第一次的(3/5)，第三次运出450吨，这批化肥共有多少吨？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">200 * (3/5)</gadget>
<output>120</output>

<gadget id="calculator">450 + 200 + 120</gadget>
<output>770</output>

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

<gadget id="calculator">(1/3) * (3/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/3) - (1/5)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">770 / (7/15)</gadget>
<output>1_650</output>

<result>1_650</result>