The width of a rectangle is 4.2 meters, and the length is 0.5 meters more than the width. What is the area of the rectangle?
一个长方形的宽是4.2米，长比宽多0.5米，这个长方形的面积是多少平方米？
<gadget id="calculator">4.2 + 0.5</gadget>
<output>4.7</output>

<gadget id="calculator">4.2 * 4.7</gadget>
<output>19.74</output>

<result>19.74</result>