40 workers can complete a batch of parts in 30 hours. If some workers ask for leave temporarily, the rest of the workers will have to spend 50 hours to complete the batch of parts. How many people ask for leave?
40个工人用30小时可以完成一批零件．若有些工人临时请假，余下的工人要用50小时才能完成这批零件．有多少人请假？
<gadget id="calculator">1 / 30 / 40</gadget>
<output>1/1_200 = around 0.000833</output>

<gadget id="calculator">(1/1_200) * 50</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / (1/24)</gadget>
<output>24</output>

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

<result>16</result>