The length of a rectangle is 3.37 meters and the width is 1.63 meters. What is the perimeter of the rectangle in meters?
一个长方形的长是3.37米，宽是1.63米，这个长方形的周长是多少米．
<gadget id="calculator">3.37 + 1.63</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>