To assemble 3,150 tape recorders, the original plan was to finish the assembly in 30 days, but actually 126 sets were installed every day, how many days earlier than planned?
要组装3150台收录机，原计划30天装完，实际每天装126台，实际比计划提前几天？
<gadget id="calculator">3_150 / 126</gadget>
<output>25</output>

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<result>5</result>