A wooden picture frame, 6 decimeters long and 4 decimeters wide. To make 2 such picture frames, at least how many decimeters of wooden strips should be used?
一种木质画框，长6分米，宽4分米．制作2个这样的画框，至少要用木条多少分米？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 2 * 2</gadget>
<output>40</output>

<result>40</result>