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

### Instruction:
There are 80 passengers on the airplane where the number of men and women is equal. The rest of the passengers are children. How many children are on the airplane if there are 30 men?

### Response:
Since the number of men and women is equal, then there are a total of 30 + 30 = <<30+30=60>>60 men and women.
Thus, 80 - 60 = <<80-60=20>>20 children are on the airplane.
#### 20