The perimeter of a rectangle is 36cm, and the ratio of length to width is 2:1, what is its area in cm**2.
一个长方形周长是36cm，长与宽的比是2：1，它的面积是多少cm**2．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

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

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

<gadget id="calculator">18 * (2/3)</gadget>
<output>12</output>

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

<gadget id="calculator">18 * (1/3)</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>