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

### Instruction:
 马克这周在学校有10个水果要吃。星期五，他决定留下2个水果到下周。然后他带着剩下的3个水果去学校一整天。马克在这周的前四天吃了多少个水果？


### Response:
 这周只吃了10 - 2 = <<10-2=8>>8个水果。
减去星期五的零食，马克在这周的前四天吃了8 - 3 = <<8-3=5>>5个水果。