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

### Instruction:
 阿奇需要在他的后院铺设草坪，后院的尺寸是20码乘以13码。他的小屋占地3码乘以5码。阿奇需要多少平方码的草坪？


### Response:
 20 * 13 = <<20*13=260>>260平方码
3 * 5 = <<3*5=15>>15平方码
260 - 15 = <<260-15=245>>245平方码
阿奇需要245平方码的草坪。