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

### Instruction:
Ernest bought 50 meters of wire and cut it into 5 equal parts. He then used 3 parts of the wire. How many meters of wire is not used?

### Response:
Each part of the wire is 50/5 = <<50/5=10>>10 meters long.
Ernest did not use 50 - 30 = <<50-30=20>>20 meters of the wire.
#### 20