<human>:  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?
<bot>: How many visitors fell ill? ** If there were 500 visitors, and 40% of them fell ill, the number of visitors who fell ill is 40/100*500 = <<40/100*500=200>>200 people
How many visitors did not fall ill? ** The number of visitors who did not get ill is 500-200 = <<500-200=300>>300
#### 300