For a batch of goods, 1/4 of the total amount was transported for the first time, and 30% of the total amount was transported for the second time, and the amount transported for the first time was 30 tons less than the second time. How many tons is this shipment in total?
一批货物，第一次运走总数的(1/4)，第二次又运走总数的30%，第一次运的比第二次少30吨．这批货物共有多少吨？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">(3/10) - (1/4)</gadget>
<output>1/20 = around 0.05</output>

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

<result>60</result>