The original cargo in the warehouse was 56 tons, and 9 trucks were transported today. If each truck transports c tons, how many tons of cargo are left in the warehouse?
仓库原有货物56吨，今天运走了9车，如果每车运c吨，那么仓库里还剩货物多少吨？
<gadget id="calculator">56 - 9</gadget>
<output>47</output>

<result>47</result>