A rectangular piece of paper is 18 cm long and 10 cm longer than its width, what is the width of the rectangle in cm?
一张长方形纸片，长18厘米，比宽长10厘米，长方形的宽是多少厘米．
<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<result>8</result>