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

### Instruction:
 埃里克有20颗弹珠。他有12颗白色弹珠，6颗蓝色弹珠，剩下的都是绿色弹珠。埃里克有多少颗绿色弹珠？


### Response:
 埃里克总共有12 + 6 = <<12+6=18>>18颗白色和蓝色弹珠。
因此，他有20 - 18 = <<20-18=2>>2颗绿色弹珠。