First find Charlie's floor number by dividing Frank's floor number by 4: 16 / 4 = <<16/4=4>>4

Then add 2 to find Dennis' floor number: 4 + 2 = <<4+2=6>>6

# Answer

6
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Dennis lives two floors above Charlie. Charlie lives on a floor whose number is 1/4 Frank's floor number. Frank lives on the 16th floor. What floor does Dennis live on?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
6
Dennis lives two floors above Charlie. Charlie lives on a floor whose number is 1/4 Frank's floor number. Frank lives on the 16th floor. What floor does Dennis live on?
train