conversations.from: human
conversations.value: After a visit to the newly opened aquarium, 40 percent of the aquarium visitors fell ill from a mysterious disease. If there were 500 visitors, how many of them did not fall ill?
  How to solve this?
conversations.from: assistant
conversations.value: If there were 500 visitors, and 40% of them fell ill, the number of visitors who fell ill is 40/100*500 = 200 people
  The number of visitors who did not get ill is 500-200 = 300