If the width of a rectangle is 2 cm and the perimeter is 5 times the width, what is the length of the rectangle in cm?
如果一个长方形的宽是2厘米，周长是宽的5倍，这个长方形的长是多少厘米．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">2 * (5/2)</gadget>
<output>5</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>