A rectangle has a perimeter of 90 cm and the ratio of length to width is 2:7. What is the area of the rectangle?
一个长方形，周长为90厘米，长和宽的比是2：7，这个长方形的面积是多少．
<gadget id="calculator">90 / 2</gadget>
<output>45</output>

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

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

<gadget id="calculator">45 * (2/9)</gadget>
<output>10</output>

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

<gadget id="calculator">45 * (7/9)</gadget>
<output>35</output>

<gadget id="calculator">10 * 35</gadget>
<output>350</output>

<result>350</result>