There are 20 male workers in a workshop with an average age of 42.5 years, and 25 female workers with an average age of 38. What is the average age of the workers in this workshop?
某车间有男工20人，平均年龄42.5岁，有女工25人，平均年龄38岁，这个车间工人的平均年龄是多少岁．
<gadget id="calculator">42.5 * 20</gadget>
<output>850</output>

<gadget id="calculator">38 * 25</gadget>
<output>950</output>

<gadget id="calculator">850 + 950</gadget>
<output>1_800</output>

<gadget id="calculator">20 + 25</gadget>
<output>45</output>

<gadget id="calculator">1_800 / 45</gadget>
<output>40</output>

<result>40</result>