The ratio of the number of students in Class A and Class B is 5:4. If 9 students are transferred from Class B, then Class A will have more students than Class B (2/3). How many students are there in Class B?
甲、乙两个班的学生人数的比是5：4，如果从乙班转走9名学生，那么甲班就比乙班人数多(2/3)，这时乙班有多少人．
<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>