Answer:
The dog can eat 2/3 of a bag of food in 1 week
Explanation:
If the dog can eat 1/3 of a bag of food in 1/2 week (half of a week), and you're trying to figure out how much the dog can eat in 2/2 (which is equal to 1 week because 2/2 is one whole)
Then all we have to do is double 1/3, which will give you 2/3.