A batch of goods has been shipped, part of which has been shipped, and the ratio of the shipped to the remaining is 2:3. When another 60 tons are shipped, the ratio of the shipped to the remaining is 4:1. How many tons of goods are left?
运送一批货物，已经运了一部分，已运的和剩下的比是2：3，当再运60吨时，已运的和剩下的比是4：1，还剩下多少吨货物？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) - (2/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">60 / (2/5)</gadget>
<output>150</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<result>30</result>