<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 There are 2 sections A and B in a class, consisting of 36 students and some students respectively. The average weight of section A is 30 kg, that of section B is 30 kg, and the average weight of the whole class is 30 kg. How many students are in section B? Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
30
There are 2 sections A and B in a class, consisting of 36 students and some students respectively. The average weight of section A is 30 kg, that of section B is 30 kg, and the average weight of the whole class is 30 kg. How many students are in section B?
test