Today, Grace is 3 + 1 = <<3+1=4>>4 years old.

So, Diana is 4*2 = <<4*2=8>>8 years old today.

# Answer

8
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Diana is twice as old as Grace is today. If Grace turned 3 a year ago, how old is Diana today?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
8
Diana is twice as old as Grace is today. If Grace turned 3 a year ago, how old is Diana today?
train