The width of a rectangle is 80 cm, and the length is 5 cm less than twice the width, what is its perimeter in cm?
长方形的宽是80厘米，长比宽的2倍少5厘米，它的周长是多少厘米．
<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">160 - 5</gadget>
<output>155</output>

<gadget id="calculator">155 + 80</gadget>
<output>235</output>

<gadget id="calculator">235 * 2</gadget>
<output>470</output>

<result>470</result>