<human>:  Diana is twice as old as Grace is today. If Grace turned 3 a year ago, how old is Diana today?
<bot>: How old is Grace today? ** Today, Grace is 3 + 1 = <<3+1=4>>4 years old.
How old is Diana today? ** So, Diana is 4*2 = <<4*2=8>>8 years old today.
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