Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
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?

### Response:
 Kwa kuwa asilimia 40 ya wageni walipata ugonjwa, hii inamaanisha asilimia 100 - 40 = 60% hawakupata ugonjwa.
Hivyo, idadi ya wageni ambao hawakupata ugonjwa ni 60/100 * 500 wageni = <<60/100*500=300>>300 wageni.