The power company erected street light line poles on one side of a 3-kilometer-long road. It was planned to erect one pole every 30 meters. , Do not re-erect the number of poles.
电力公司在一条长3千米公路的一边架设路灯线路杆，计划每30米架设一根，当架设到1200米时发现有误，改为每50米架设一根，这样已架设的电线杆中，不要重新架设的电线杆有多少根．
<gadget id="calculator">2 * 5 * 3 * 5</gadget>
<output>150</output>

<gadget id="calculator">1_200 / 150</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>