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

### Instruction:
 卢卡斯带着20美元去商店，需要买3个每个2美元的鳄梨。他带回家多少零钱？


### Response:
 鳄梨的价格是6美元，因为3乘以2等于6。
他带回家的零钱是20 - 6 = 14美元。