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

### Instruction:
 格蕾丝的年龄是她奶奶年龄的3/8。她奶奶的年龄是格蕾丝母亲年龄的两倍。如果格蕾丝的母亲80岁，那么格蕾丝多大？


### Response:
 格蕾丝的奶奶是2 * 80岁 = <<2*80=160>>160岁。
格蕾丝的年龄是3/8 * 160岁 = <<3/8*160=60>>60岁。