There are 245 students in the fourth grade of Zhongshan Primary School participated in 3 interest groups. Among them, 175 people participated in the art interest group, 25 people participated in the literature and art interest group, and how many people participated in the sports interest group.
中山小学四年级有245人分别参加了3个兴趣小组．其中，参加美术兴趣小组有175人，参加文艺兴趣小组有25人，参加体育兴趣小组有多少人．
<gadget id="calculator">245 - 175 - 25</gadget>
<output>45</output>

<result>45</result>