A pile of goods weighs 60 tons and is transported by a vehicle with a load capacity of 4 tons. It has been transported 13 times. How many tons of cargo are left unshipped?
一堆货物重60吨，用一辆载重量为4吨的汽车来运，已经运了13次．还剩下多少吨货物没有运？
<gadget id="calculator">13 * 4</gadget>
<output>52</output>

<gadget id="calculator">60 - 52</gadget>
<output>8</output>

<result>8</result>