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

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

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">14 * (3/7)</gadget>
<output>6</output>

<result>6</result>