There are 40 male workers in a factory, and the ratio of male workers to female workers is 4:5. How many female workers are there?
某工厂有男职工40人，男职工与女职工人数的比是4：5，女职工有多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<result>50</result>