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.
<span>Formed by two rays with a common endpoint. The endpoint is the vertex. And the two rays are the sides. Example name= PQR (Q is the vertex)</span>