The perimeter of a rectangle is 500 cm, and the ratio of length to width is 2:1, what is its area in square centimeters?
一个长方形的周长是500厘米，长与宽的比是2：1，它的面积是多少平方厘米？
<gadget id="calculator">500 / 2</gadget>
<output>250</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">250 * (2/3) * 250 * (1/3)</gadget>
<output>125_000/9 = around 13_888.888889</output>

<result>125_000/9 = around 13_888.888889</result>