The area of a rectangle is 48 square centimeters, the width is 4 centimeters, and the length is in centimeters.
一个长方形的面积是48平方厘米，宽是4厘米，长是多少厘米．
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>