A rectangle has a perimeter of 36 cm and a ratio of length to width of 7:2. What is the area of the rectangle in square centimeters?
一个长方形，它的周长是36cm，长宽的比是7：2，这个长方形的面积是多少平方厘米．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">7 + 2</gadget>
<output>9</output>

<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">18 * (7/9)</gadget>
<output>14</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">18 * (2/9)</gadget>
<output>4</output>

<gadget id="calculator">14 * 4</gadget>
<output>56</output>

<result>56</result>