The garment factory plans to produce 750 sets of garments. It has been produced for 9 days, with an average of 50 sets per day. The remaining requirements are completed in 4 days, how many sets should be produced on average per day?
服装厂计划生产750套服装，已经生产了9天，平均每天生产50套．剩下的要求4天完成，平均每天要生产多少套？
<gadget id="calculator">50 * 9</gadget>
<output>450</output>

<gadget id="calculator">750 - 450</gadget>
<output>300</output>

<gadget id="calculator">300 / 4</gadget>
<output>75</output>

<result>75</result>