A chicken farm is a rectangle, one of its long sides is a brick wall, and the other side is surrounded by a fence wall. It is known that the length is 18 meters and the width is 10 meters. Q: How many meters is the total length of the fence?
一个养鸡场是个长方形，它的一条长边是砖墙，其他边是用篱笆墙围成的，已知长是18米，宽是10米．问：篱笆墙总长是多少米？
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">18 + 20</gadget>
<output>38</output>

<result>38</result>