rectangular piece of glass is twice as long as it is wide, and its perimeter is 54 decimeters. What is the area of this rectangle?
一块长方形玻璃，长是宽的2倍，周长是54分米，这个长方形的面积是多少？
<gadget id="calculator">54 / 2</gadget>
<output>27</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">27 * (2/3)</gadget>
<output>18</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">27 * (1/3)</gadget>
<output>9</output>

<gadget id="calculator">18 * 9</gadget>
<output>162</output>

<result>162</result>