<|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
 David completes a piece of work in 5 days, John completes the same work in 9 days, and Mary completes the same work in 7 days. If all three of them work together, and the work consists of making a thousand stuffed animals, then how many days are required to complete the work? 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
3
David completes a piece of work in 5 days, John completes the same work in 9 days, and Mary completes the same work in 7 days. If all three of them work together, and the work consists of making a thousand stuffed animals, then how many days are required to complete the work?
test