The perimeter of a rectangle is 56 cm, and the ratio of width to length is 2:5. What is the area of the rectangle?
一个长方形的周长是56厘米，宽和长的比是2：5，这个长方形的面积是多少．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">56 / 2 / 7</gadget>
<output>4</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<result>160</result>