The tsunami hit Southeast Asia caused huge losses to people's lives and properties. The students of Xinxin Middle School actively raised donations and showed love. A total of 50 students in a certain class donated money. Among them, the class leader donated an average of 8 yuan each, and the other students donated an average of 5 yuan each. A total of 265 yuan was donated. How many people are there in the class leader?
东南亚地区受到的海啸袭击，使人们的生命财产受到巨大损失，新颖中学学生积极募捐奉献爱心．某班共有50名学生捐款，其中班干部平均每人捐8元，其他学生平均每人捐5元，共收到捐款265元，问班干部有几人？
<gadget id="calculator">50 * 5</gadget>
<output>250</output>

<gadget id="calculator">265 - 250</gadget>
<output>15</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<result>5</result>