<|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
 Five years ago, the sum of Sebastian's age, his sister's age, and their cousin's age was 3/4 of their father's age. Sebastian is currently 40 years old and 10 years older than his sister. Their cousin is the same age as Sebastian. How old is their father today? 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
132
Five years ago, the sum of Sebastian's age, his sister's age, and their cousin's age was 3/4 of their father's age. Sebastian is currently 40 years old and 10 years older than his sister. Their cousin is the same age as Sebastian. How old is their father today?
test