The emergency rescue center needs to transport a batch of daily necessities to the earthquake-stricken area. If each vehicle loads 3 tons, this batch of goods will not be able to transport 2 tons; if each vehicle loads another 1 ton, it can still be loaded Other items 1 ton. Please answer: How many tons is this batch of goods?
紧急救援中心要运一批生活用品到地震灾区，如果每辆车装3吨，这批货物就有2吨运不完；如果每辆车再装1吨，装完这批货物后还可以装其它物品1吨．请回答：这批货物有多少吨．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

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

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 + 2</gadget>
<output>11</output>

<result>11</result>