Step-by-step explanation:
take into 2 sections
-5<a-4 and a-4<2
-1<a and a<6
therefore it should be the 2nd one
Https://photomath.net/s/P56lb
The link will show you how to solve the problem but if you still don't get it you download the app Photomath and it will give you more detailed steps.
6 people because there is 2 times as many humans compared to pets. so 3 x 2 = 6!