The perimeter of a rectangle is 32 cm, the length is 9 cm, and how many cm is the width? (solution by equation)
一个长方形的周长是32厘米，长是9厘米，宽是多少厘米？(用方程解)
<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">32 - 18</gadget>
<output>14</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<result>7</result>