A rectangle has a perimeter of 48 cm and its length is 4 cm more than its width. What is the width of the rectangle in cm?
一个长方形周长48厘米，其中长比宽多4厘米，这个长方形的宽是多少厘米．
<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<gadget id="calculator">24 - 4</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>