conversations.from: human
conversations.value: Can you explain how to solve this math problem: 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?
conversations.from: assistant
conversations.value: In the park, 50 benches with a capacity of four people each have a total capacity of 50*4 = 200 sitting spaces.
  If 80 people are already using spaces, the number of empty spaces is 200-80 =120