Each package of dog treats has 15 treats.
The equation d = 15t, where d represents the total number of dog treats and t represents number of packages, shows this relationship.
If Esther bought 60 dog treats total, how many packages did she buy?
To find the number of packages Esther bought, we need to solve the equation d = 15t for t.
Given that d = 60, we have:
60 = 15t
Dividing both sides of the equation by 15:
60/15 = 15t/15
4 = t
Esther bought 4 packages of dog treats. Answer: \boxed{4}.