A certain workshop has male workers who are female workers (4/5), and after 5 male workers are transferred away, the male workers are now female workers (7/10), how many male workers were there in the workshop?
某车间男职工是女职工的(4/5)，男工调走5人后，这时男工是女工的(7/10)，车间原有男职工多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(4/5) - (7/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5 / (1/10)</gadget>
<output>50</output>

<gadget id="calculator">50 * (4/5)</gadget>
<output>40</output>

<result>40</result>