Li Hua's average step length is 0.56 meters. The perimeter of a rectangular vegetable field is 125 steps. If the length of the vegetable field is 20 meters, how many meters is the width?
李华的平均步长是0.56米，步测一块长方形菜地的周长共125步，如果菜地长是20米，宽是多少米
<gadget id="calculator">0.56 / 2</gadget>
<output>0.28</output>

<gadget id="calculator">125 * 0.28</gadget>
<output>35</output>

<gadget id="calculator">35 - 20</gadget>
<output>15</output>

<result>15</result>