The perimeter of a rectangle is 48 cm, and the ratio of length to width is 3:5. What is the length of the rectangle in cm?
一个长方形的周长是48cm，长和宽的比是3：5，这个长方形的长是多少cm？
<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">24 * (5/8)</gadget>
<output>15</output>

<result>15</result>