A rectangular pool has a circumference of 36 meters and a length of 10 meters. What is its width in meters?
一个长方形的水池，周长是36米，长是10米，它的宽是多少米？
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<result>8</result>