The perimeter of a rectangle is 80 cm, and the ratio of length to width is 7:1. What is the area of the rectangle?
一个长方形的周长是80厘米，长与宽的比是7：1，这个长方形的面积是多少平方厘米？
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">40 * (7/8)</gadget>
<output>35</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">40 * (1/8)</gadget>
<output>5</output>

<gadget id="calculator">35 * 5</gadget>
<output>175</output>

<result>175</result>