Question

there are 7 chimpanzees at the zoo the mother chimpanzee usually has a baby every 4 years how many babies can she have in 28 years

Answer 1

Are you saying that every chimpanzee is a mother? If so, then each chimpanzee would have a baby 7 times in 28 years, meaning there would be 49 chimpanzees.

If you mean just one, then only 7 babies in 28 years.