Since a dozen is equal to 12, then two dozens are equal to 12 x 2= <<24=24>>24.

One-half dozen is equal to 12/2 = <<12/2=6>>6.

Thus, Bruno will have a total of 24 + 6 = <<24+6=30>>30 pens.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Bruno wants to buy two and one-half dozens of pens. How many pens will he have?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
30
Bruno wants to buy two and one-half dozens of pens. How many pens will he have?
train