Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Diana is twice as old as Grace is today. If Grace turned 3 a year ago, how old is Diana today?

### Response:
When Grace turned 3, Diana was 6.
Today, Diana is twice as old as Grace is today, which is 4.
Diana is 4 x 2 = <<4*2=8>>8 years old today.
#### 8

