Each turn Barry takes standing on his head lasts for 10+5=<<10+5=15>>15 minutes.

2 hours is 60*2=<<2*60=120>>120 minutes.

Barry can take 120/15=<<120/15=8>>8 turns standing on his head over two hours.

# Answer

8
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Barry stands on his head for 10 minutes at a time, but then he must sit for 5 minutes before he can take another turn standing on his head.  How many turns can Barry take standing on his head during a single 2-hour period?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
8
Barry stands on his head for 10 minutes at a time, but then he must sit for 5 minutes before he can take another turn standing on his head.  How many turns can Barry take standing on his head during a single 2-hour period?
train