Answer:
Yes, she is correct.
Step-by-step explanation:
In the question it is given that Avannah wants to buy food for her dog that may lasts for 2 weeks (or 14 days). Dogs must serve food according to their breed and their weight. The diet of every dog is different. Avannah needs to feed her dog three times a day. So a 20 lb bag of food is enough for her to feed her dog for 2 weeks.
So it is the correct decision to get a 20 lb bag of food for her dog. It will last for 14 days.