The first workshop of a textile factory has 50 people, the second workshop has twice the number of people in the first workshop, and the third workshop has 20 more people than the sum of the two workshops. How many people are there in the third workshop?
纺织厂第一车间有50人，第二车间的人数是第一车间的2倍，第三车间比这两个车间人数的和的2倍多20人．第三车间有多少人？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">150 * 2</gadget>
<output>300</output>

<gadget id="calculator">300 + 20</gadget>
<output>320</output>

<result>320</result>