The length of the rectangle is 196 centimeters, and the width is 28 centimeters. Now reduce the length by 4 times. If the area of the rectangle does not change, what must be done about the width of the rectangle?
长方形的长是196厘米，宽是28厘米，现在把长缩小4倍，要想使长方形的面积不发生变化，长方形的宽必须怎么办？
<gadget id="calculator">196 / 4</gadget>
<output>49</output>

<gadget id="calculator">28 / 49</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">196 * (4/7)</gadget>
<output>112</output>

<gadget id="calculator">112 / 28</gadget>
<output>4</output>

<result>4</result>