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

### Instruction:
 艾瑞克有4颗忍者飞镖。他的朋友查德有他的两倍。然后杰夫从查德那里买了2颗忍者飞镖。现在杰夫有6颗飞镖。他们一共有多少忍者飞镖？


### Response:
 艾瑞克有4颗飞镖
查德有2 x 4颗 = <<2*4=8>>8颗飞镖
卖了2颗给杰夫后，查德剩下8颗 - 2颗 = <<8-2=6>>6颗飞镖
一共，艾瑞克有4颗飞镖 + 查德有6颗飞镖 + 杰夫有6颗飞镖 = <<4+6+6=16>>16颗飞镖