A rectangle has a perimeter of 35 meters and a length of 12.5 meters, what is its width in meters?
一个长方形的周长是35米，长是12.5米，它的宽是多少米？
<gadget id="calculator">35 / 2</gadget>
<output>35/2 = around 17.5</output>

<gadget id="calculator">(35/2) - 12.5</gadget>
<output>5</output>

<result>5</result>