A farm tool factory needs to produce 4000 pieces of farm tools, with an average of 500 pieces per day in the first 5 days, and the rest should be completed within 2 days. How many pieces should be produced on average per day?
一个农具厂要生产4000件农具，前5天平均每天生产500件，余下的要在2天内完成．平均每天应生产多少件？
<gadget id="calculator">500 * 5</gadget>
<output>2_500</output>

<gadget id="calculator">4_000 - 2_500</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 / 2</gadget>
<output>750</output>

<result>750</result>