The agricultural machinery factory originally planned to complete the production task of a batch of rice transplanters in 20 days, but actually produced 175 units per day. As a result, the task was completed 4 days earlier than the original plan. How many units were originally planned to be produced per day?
农机厂原计划20天完成一批插秧机的生产任务，实际每天生产175台，结果比原计划提前4天完成任务，原计划每天生产多少台？
<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<gadget id="calculator">175 / 20</gadget>
<output>35/4 = around 8.75</output>

<gadget id="calculator">16 * (35/4)</gadget>
<output>140</output>

<result>140</result>