The length of a rectangle is 46 cm and its width is 20 cm less than its length. What is its perimeter in cm?
一个长方形长46厘米，宽比长少20厘米，它的周长是多少厘米．
<gadget id="calculator">46 - 20</gadget>
<output>26</output>

<gadget id="calculator">46 + 26</gadget>
<output>72</output>

<gadget id="calculator">72 * 2</gadget>
<output>144</output>

<result>144</result>