The perimeter of a rectangular paddy field is 240 meters, and the ratio of length to width is 5:3. What is the area of the paddy field in square meters?
一块长方形稻田的周长是240米，长与宽的比是5：3，这块稻田的面积是多少平方米？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">240 / 2 / 8</gadget>
<output>15</output>

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">75 * 45</gadget>
<output>3_375</output>

<result>3_375</result>