There are 45 students in class one of the second grade, among which there are 5 fewer girls than boys. How many boys are there in this class?
二年级一班有学生45人，其中女生比男生少5人．这个班男生有多少人．
<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<result>25</result>