The telecommunications bureau wants to erect a communication line, and plans to erect 80 meters per day, which will be completed in 25 days. If 100 meters are erected every day, how many days can it be completed? (solution by equation)
电信局要架设一条通讯线路，计划每天架设80米，25天完成．如果每天架设100米，多少天可以完成？(用方程解)
<gadget id="calculator">80 * 25</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 100</gadget>
<output>20</output>

<result>20</result>