She spent $30/2=$<<30/2=15>>15 on rides.

She spent a total of $15+$5=$<<15+5=20>>20 including dessert.

She has $30-$20=$<<30-20=10>>10 left.

# Answer

10
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Hannah brought $30 to the county fair. She spent half of it on rides and another $5 on dessert. How much, in dollars, is left?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
10
Hannah brought $30 to the county fair. She spent half of it on rides and another $5 on dessert. How much, in dollars, is left?
train