Uncle workers dig the soil to build a number of houses in residential areas. 12 trucks of soil can be transported per hour, and after 5 hours of transportation, there are still 30 trucks of soil that have not been transported. How many trucks of soil need to be transported in total?
工人叔叔挖土准备建造一批居民区的房子．每小时能运走12车的泥土，运了5小时后还有30车的泥土没运完，一共需要运走几车泥土？
<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<gadget id="calculator">60 + 30</gadget>
<output>90</output>

<result>90</result>