Today's attendance rate of the first workshop of the textile factory is 80%. According to the statistics of the number of absentees, there are 3 people on sick leave and 1 person on personal leave. Today, 50% of the workshop needs to be sent to participate in training. How many workers are there to participate in the training?
纺织厂一车间今天的出勤率为80%，统计缺勤人数，病假3人，事假1人．今天需要派车间的50%去参加培训，去参加培训的工人有多少人？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / (1/5)</gadget>
<output>20</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 * (1/2)</gadget>
<output>10</output>

<result>10</result>