A 24 cm wire forms a rectangle, if the length is 7 cm, what is the width in cm?
一根24厘米的铁丝围成一个长方形，若长是7厘米，宽应该是多少厘米．
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 7</gadget>
<output>5</output>

<result>5</result>