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?
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.
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Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
You are solving math problems. Here are some examples of how to solve the task:

James can make 4 hats out of one yard of velvet. He needs three yards of velvet to make a cloak. How much velvet does he need to make 6 cloaks and 12 hats?First find the total amount of velvet James uses on the hats: 12 hats / 4 hats/yard = <<12/4=3>>3 yards
Then find the total amount of velvet he needs to make the cloaks: 6 cloaks * 3 yards/cloak = <<6*3=18>>18 yards
Then add those two amounts to find the total amount of velvet he needs: 3 yards + 18 yards = <<3+18=21>>21 yards
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Fifteen more than a quarter of a number is 27. What is the number?A quarter of the number is 27-15=<<27-15=12>>12.
The number is 12*4=<<12*4=48>>48.
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Now, solve this next question in the style of the above examples:

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.
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