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

### Instruction:
 伊凡有20个骰子。杰瑞比伊凡多两倍的骰子。他们一共有多少个骰子？


### Response:
 杰瑞有2*20=<<2*20=40>>40个骰子
他们一共有20+40=<<20+40=60>>60个骰子