<human>:  A park has 50 benches with a capacity of 4 people each. On a Sunday afternoon, 80 people were sitting on the benches. What's the number of available spaces on the benches that other people can sit on before the carrying capacity of the benches is full?
<bot>: How many sitting spaces are there in the park? ** In the park, 50 benches with a capacity of four people each have a total capacity of 50*4 = <<50*4=200>>200 sitting spaces.
How many empty spaces are there? ** If 80 people are already using spaces, the number of empty spaces is 200-80 =120
#### 120