The two calligraphy groups handed in a total of 175 works, with 15 people in the first group and 20 people in the second group. How many pieces of work did each person complete on average?
两个书法小组一共交了175幅作品，第一组15人，第二组20人．平均每人完成几幅作品？
<gadget id="calculator">15 + 20</gadget>
<output>35</output>

<gadget id="calculator">175 / 35</gadget>
<output>5</output>

<result>5</result>