The fruit company wants to ship a batch of fruits, 30% for the first time, and if they ship another 20 tons, the ratio of the already shipped to the remaining is 2:3. How many tons is this batch of fruit?
水果公司要运一批水果，第一次运30%，如果再运20吨，这时已运的和剩下的比是2：3．这批水果有多少吨？
<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">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/5) - (3/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">30 / (1/10)</gadget>
<output>300</output>

<result>300</result>