A rectangle with a length of 80 cm is surrounded by 3 times its width. What is the width of this rectangle in cm?
用长是80厘米长的铁丝围成一个长方形，长是宽的3倍，这个长方形的宽是多少厘米？
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 * (1/4)</gadget>
<output>10</output>

<result>10</result>