<|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
 A student scored an average of 70 marks in 3 subjects: physics, chemistry, and mathematics. The average marks in physics and mathematics is 90, and that in physics and some other subject is 70. The student scored 110 marks in physics. What is the other subject with which the average is 70? 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
70
A student scored an average of 70 marks in 3 subjects: physics, chemistry, and mathematics. The average marks in physics and mathematics is 90, and that in physics and some other subject is 70. The student scored 110 marks in physics. What is the other subject with which the average is 70?
test