The perimeter of a rectangular picture of the Bird's Nest in Beijing is 80 cm, and its length is 24 cm. How many centimeters is it wide? (solution by equation)
一张长方形的北京鸟巢画片的周长是80厘米，它的长是24厘米．它的宽是多少厘米？(用方程解)
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">40 - 24</gadget>
<output>16</output>

<result>16</result>