The construction site plans to transport 400 tons of cement. 18 vehicles have been used to transport it, and the remaining 40 tons have not yet been transported. How many tons of cement does each truck transport on average?
建筑工地计划运进400吨水泥．已经用18辆车运了一趟，剩下40吨还没运．平均每辆车运多少吨水泥？
<gadget id="calculator">400 - 40</gadget>
<output>360</output>

<gadget id="calculator">360 / 18</gadget>
<output>20</output>

<result>20</result>