He got 10/2=<<10/2=5>>5 paid

That means he paid 5*3=$<<5*3=15>>15

# Answer

15
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Bob buys nose spray.  He buys 10 of them for a "buy one get one free" promotion.  They each cost $3.  How much does he pay?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
15
Bob buys nose spray.  He buys 10 of them for a "buy one get one free" promotion.  They each cost $3.  How much does he pay?
train