A certain factory has 200 workers, of which 40% are male workers. Later, a group of male workers were transferred in. At that time, the ratio of male workers to the whole factory was 3:7. How many male workers were transferred later?
某工厂有职工200人，其中男职工占40%，后来又调进一批男职工，这时男职工与全厂职工的人数比是3﹕7，后来又调进多少名男职工？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">200 * (2/5)</gadget>
<output>80</output>

<gadget id="calculator">200 - 80</gadget>
<output>120</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">120 / (4/7)</gadget>
<output>210</output>

<gadget id="calculator">210 * (3/7)</gadget>
<output>90</output>

<gadget id="calculator">90 - 80</gadget>
<output>10</output>

<result>10</result>