Xinguang TV Factory planned to produce 5,400 TV sets, and produced 1,800 sets in the first 10 days. According to this calculation, how many days will it take for the remaining tasks to be completed? (Solve with ratio)
新光电视机厂计划生产5400台电视机，开始10天生产了1800台．照这样计算，剩下的任务还要几天才能完成？(用比例解)
<gadget id="calculator">5_400 - 1_800</gadget>
<output>3_600</output>

<gadget id="calculator">1_800 / 10</gadget>
<output>180</output>

<gadget id="calculator">3_600 / 180</gadget>
<output>20</output>

<result>20</result>