The area of a rectangle is 40 square centimeters, the width is 5 centimeters, and the length is in centimeters.
一个长方形的面积是40平方厘米，宽是5厘米，长是多少厘米．
<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<result>8</result>