There is a rectangle whose perimeter is 64 cm, and whose length, width, and length are 5:3, what is the area of this rectangle?
有一个长方形，周长是64厘米，该长方形的长宽长是5：3，求这个长方形的面积是多少？
<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>