Two trucks with a load of 8 tons are used to transport a batch of cement. Each truck has been transported twice, and there are still 12 tons left undelivered. How many tons of this batch of cement are there?
用2辆载重8吨的卡车运一批水泥，每辆车运了2次，还剩12吨没运，这批水泥原有多少吨？
<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">16 + 16</gadget>
<output>32</output>

<result>32</result>