Question

A group of mountain gorillas has 10 members. How big is the group after 4 females emigrate, 2 females immigrate, 2 gorillas are born, and a male dies?(1 point)

1

7

13

9

Answer 1

Start with 10. After 4 emigrate: 10 − 4 = 6. After 2 immigrate: 6 + 2 = 8. After 2 born: 8 + 2 = 10. After 1 male dies: 10 − 1 = 9.

Answer: 9.