A rectangular piece of glass with an area of 90 square decimeters is 5 decimeters wide and how many decimeters long.
一块面积为90平方分米的长方形玻璃，宽是5分米，长是多少分米．
<gadget id="calculator">90 / 5</gadget>
<output>18</output>

<result>18</result>