<|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
 Rong Rong transferred from Class One to Class Two, and Lei Lei transferred from Class Two to Class One. As a result, the average height of students in Class One increased by 2 centimeters, and the average height of students in Class Two decreased by 3 centimeters. If Lei Lei's height is 158 centimeters and Rong Rong's height is 140 centimeters, determine the total number of students in the two classes. 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
15
Rong Rong transferred from Class One to Class Two, and Lei Lei transferred from Class Two to Class One. As a result, the average height of students in Class One increased by 2 centimeters, and the average height of students in Class Two decreased by 3 centimeters. If Lei Lei's height is 158 centimeters and Rong Rong's height is 140 centimeters, determine the total number of students in the two classes.
test