Master Li makes a batch of parts. If he makes 24 parts per day on average, it will be completed one day later than planned. If he makes 40 parts per day on average, it will be completed one day earlier than planned. In order to complete it according to plan, how many parts does he make per day on average? ?
李师傅做一批零件，如果他平均每天做24个，将比计划推迟一天完成，如果他平均每天做40个，将比计划提前一天完成，为了按计划完成，他平均每天要做多少个零件？
<gadget id="calculator">24 * 1</gadget>
<output>24</output>

<gadget id="calculator">40 * 1</gadget>
<output>40</output>

<gadget id="calculator">24 + 40</gadget>
<output>64</output>

<gadget id="calculator">40 - 24</gadget>
<output>16</output>

<gadget id="calculator">64 / 16</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">24 * (5/4)</gadget>
<output>30</output>

<result>30</result>