Due to market adjustment needs, a mining company reduced its production in the second quarter by 25% compared to the first quarter, and plans to increase production by 30,000 tons in the third quarter, so that the output in the third quarter will increase by -20% compared to the first quarter. How many tons is it?
某矿业公司因市场调节需要，第二季度产量比第一季度减产二成五，第三季度计划增加产量3万吨，这样第三季度产量比第一季度增长-20%，第一季度的产量是多少万吨？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) - (3/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">3 / (1/20)</gadget>
<output>60</output>

<result>60</result>