rectangle has a width of 6 decimeters and an area of 30 square decimeters, what is the length of this rectangle in decimeters?
一个长方形宽6分米，面积是30平方分米，这个长方形的长是多少分米．
<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<result>5</result>