The school allocates dormitories for freshmen. If there are 3 people in each room, 23 people will not be accommodated. If there are 5 people in each room, 3 rooms will be vacant. How many dormitories does the school have?
学校为新生分配宿舍，每个房间住3人，则有23人安排不进去，如果每个房间住5人，则空出3个房间．学校现有多少间宿舍？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">23 + 15</gadget>
<output>38</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">38 / 2</gadget>
<output>19</output>

<result>19</result>