The perimeter of a rectangle is 126 cm, and the ratio of length to width is 4:3, what is the length of the rectangle in cm?
一个长方形的周长是126厘米，长和宽的比是4：3，这个长方形的长是多少厘米．
<gadget id="calculator">126 / 2</gadget>
<output>63</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">63 / 7</gadget>
<output>9</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>