Grandma Wang's house has a rectangular vegetable field against the wall, 25 meters long and 12 meters wide. If a fence is built around this vegetable field, how long should the fence be at least?
王奶奶家有一块靠墙的长方形菜地，长25米，宽12米．如果给这块菜地围上篱笆，篱笆至少长几米？
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">25 + 24</gadget>
<output>49</output>

<result>49</result>