The circumference of a table is 180 cm, the length is 5 decimeters, and the width is how many decimeters.
一桌面周长为180厘米，长为5分米，宽为多少分米．
<gadget id="calculator">180 / 10</gadget>
<output>18</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<result>4</result>