rope is 64 cm long and it forms a rectangle with a length of 19 cm. What is its width in cm? (solution by equation)
一根绳子长64厘米，用它围成一个长19厘米的长方形，它的宽是多少厘米？(用方程解)
<gadget id="calculator">64 / 2</gadget>
<output>32</output>

<gadget id="calculator">32 - 19</gadget>
<output>13</output>

<result>13</result>