One car transports 420 kg of goods, and the other car transports 29 kg less than it. How many kilograms are the two vehicles carrying in total?
一辆车运货420千克，另一辆车比它少运29千克．两辆车一共运货多少千克？
<gadget id="calculator">420 - 29</gadget>
<output>391</output>

<gadget id="calculator">420 + 391</gadget>
<output>811</output>

<result>811</result>