If a 78 cm long iron wire is used to form a rectangle whose length to width ratio is 10:3, what is the area of the rectangle in square centimeters?
用一根78厘米长的铁丝围成一个长与宽的比是10：3的长方形，这个长方形的面积是多少平方厘米？
<gadget id="calculator">78 / 2</gadget>
<output>39</output>

<gadget id="calculator">10 + 3</gadget>
<output>13</output>

<gadget id="calculator">10 / 13</gadget>
<output>10/13 = around 0.769231</output>

<gadget id="calculator">39 * (10/13)</gadget>
<output>30</output>

<gadget id="calculator">3 / 13</gadget>
<output>3/13 = around 0.230769</output>

<gadget id="calculator">39 * (3/13)</gadget>
<output>9</output>

<gadget id="calculator">30 * 9</gadget>
<output>270</output>

<result>270</result>