The perimeter of a rectangle is 64 cm, and the ratio of length to width is 5:3. What is the area of the rectangle in square centimeters?
一个长方形的周长是64厘米，长与宽的比是5：3，这个长方形的面积是多少平方厘米．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">64 / 2 / 8</gadget>
<output>4</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<result>240</result>