A rectangle whose width is 4 decimeters and whose length is three times its width, what is the area of the rectangle?
一个长方形宽是4分米，长是宽的3倍，这个长方形的面积是多少．
<gadget id="calculator">4 * 3 * 4</gadget>
<output>48</output>

<result>48</result>