There are 145 male employees in a certain factory, and the number of female employees is 30 less than 4 times that of male employees. How many female employees are there?
某工厂有男职工145人，女职工的人数比男职工的4倍少30人，有女职工多少人？
<gadget id="calculator">145 * 4</gadget>
<output>580</output>

<gadget id="calculator">580 - 30</gadget>
<output>550</output>

<result>550</result>