A rectangle has a perimeter of 24 cm and a width of 6 cm, what is the length?
一个长方形的周长是24厘米，宽6厘米，求长是多少？
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<result>6</result>