The perimeter of a rectangle is 28 cm, the ratio of length to width is 4:3, what is the length in cm?
一个长方形的周长是28厘米，长和宽的比是4：3，长是多少厘米．
<gadget id="calculator">28 / 2</gadget>
<output>14</output>

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

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">14 * (4/7)</gadget>
<output>8</output>

<result>8</result>