-21
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Simplify $16^{\frac{1}{2}}-625^{\frac{1}{2}}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-21
Simplify $16^{\frac{1}{2}}-625^{\frac{1}{2}}$.
train