The number of female workers in a factory is 80% of the male workers. Due to work needs, another 30 female workers were transferred in. At this time, the number of female workers was 10% more than that of male workers. How many male workers are there in this factory?
某工厂的女工人数是男工人的80%．因工作需要，又调入女工30人，这时女工人数比男工多10%．这个工厂有男工人多少人？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">(1/10) - (4/5)</gadget>
<output>-7/10 = around -0.7</output>

<gadget id="calculator">1 + (-7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">30 / (3/10)</gadget>
<output>100</output>

<result>100</result>