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

### Instruction:
If one fourth of the engines are defective, and there are 5 batches of 80 engines each. How many engines are not defective?

### Response:
If one-fourth of the engines are defective, and there are 5 batches of 80 engines each, the total number of engines manufactured is 80*5 = <<80*5=400>>400 engines.
The number of defective engines is 1/4*400 = <<400*1/4=100>>100 engines
The number of non-defective engines is 400-100 = <<400-100=300>>300
#### 300