There were originally 46 wooden poles on a road, and the distance between each two poles was 12 meters. Now to replace all the wooden poles with cement poles, a total of 28 cement poles are needed. How many meters should the interval between each two be changed?
一条路原有木电线杆46根，每两根之间相隔12米．现在要把木电线杆全部换成水泥电线杆，共需要28根水泥电线杆，每两根之间的间隔应改为多少米？
<gadget id="calculator">46 - 1</gadget>
<output>45</output>

<gadget id="calculator">45 * 12</gadget>
<output>540</output>

<gadget id="calculator">28 - 1</gadget>
<output>27</output>

<gadget id="calculator">540 / 27</gadget>
<output>20</output>

<result>20</result>