<|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 computer online service charges one hourly price for regular use but a higher hourly rate for designated ''premium'' areas. One customer was charged $28 after spending 2 hours in premium areas and 9 regular hours. Another spent 3 hours in the premium areas and some regular hours and was charged $27. How many regular hours did the second customer spend? 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
A computer online service charges one hourly price for regular use but a higher hourly rate for designated ''premium'' areas. One customer was charged $28 after spending 2 hours in premium areas and 9 regular hours. Another spent 3 hours in the premium areas and some regular hours and was charged $27. How many regular hours did the second customer spend?
test