20 master workers erected telephone poles on both sides of the road with a total length of 120 meters, one every 8 meters (both ends). How many telephone poles do these workers have to erect in total?
20名工人师傅在全长120米的公路两边竖电线杆，每隔8米竖一根(两端都竖)．这些工人师傅一共要竖多少根电线杆．
<gadget id="calculator">120 / 8</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<result>32</result>