There are several trucks transporting goods, if each truck transports 3.5 tons, 2 tons of this batch of goods cannot be transported away; if each truck transports 4 tons, after this batch of goods is transported, 1 ton of other goods can be loaded. How many tons is this shipment in total?
有若干辆卡车在运货，如果每辆卡车运3.5吨，这批货物就有2吨不能运走；如果每辆卡车运4吨，运完这批货物后还可以装1吨其他货物．这批货物一共有多少吨？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">4 - 3.5</gadget>
<output>0.5</output>

<gadget id="calculator">3 / 0.5</gadget>
<output>6</output>

<gadget id="calculator">6 * 3.5</gadget>
<output>21</output>

<gadget id="calculator">21 + 2</gadget>
<output>23</output>

<result>23</result>