The construction site needs to transport 1,200 bags of cement, 486 bags have been shipped, and the rest will be shipped in 21 trucks. How many bags are shipped on average?
建筑工地要运1200包水泥，已运来486包，剩下的要在21车内运完，平均车运多少包？
<gadget id="calculator">1_200 - 486</gadget>
<output>714</output>

<gadget id="calculator">714 / 21</gadget>
<output>34</output>

<result>34</result>