A certain factory had 630 employees last year, and the number of male workers was 20% of the number of female workers. This year, another group of male workers was recruited. At this time, the ratio of male and female workers was 3:7. How many male workers were recruited this year?
某厂去年有职工630人，其中男工人数是女工人数的20%，今年又招进一批男工人，这时男、女工人数的比是3：7，今年招进男工人数多少人？
<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">630 * (5/6)</gadget>
<output>525</output>

<gadget id="calculator">525 / 7</gadget>
<output>75</output>

<gadget id="calculator">75 * 3</gadget>
<output>225</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">630 * (1/6)</gadget>
<output>105</output>

<gadget id="calculator">225 - 105</gadget>
<output>120</output>

<result>120</result>