The perimeter of a rectangle is 140 meters, and the ratio of length to width is 4:3. What is the area of the rectangle?
一个长方形周长140米，长与宽的比是4：3，这个长方形的面积是多少平方米？
<gadget id="calculator">140 / 2</gadget>
<output>70</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">70 * (4/7)</gadget>
<output>40</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">70 * (3/7)</gadget>
<output>30</output>

<gadget id="calculator">40 * 30</gadget>
<output>1_200</output>

<result>1_200</result>