The processing workshop needs to process 875 parts, and it has been processed for 3.5 hours, processing 50 parts per hour. The rest process an average of 56 pieces per hour, how many hours will it take to complete the task? (solution by equation)
加工车间要加工875个零件，已经加工了3.5小时，每小时加工50个．剩下的平均每小时加工56个，还要几小时完成任务？(用方程解)
<gadget id="calculator">50 * 3.5</gadget>
<output>175</output>

<gadget id="calculator">875 - 175</gadget>
<output>700</output>

<gadget id="calculator">700 / 56</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>