My sister has $30 to spend on treats for her new puppy. She bought 1 dog bone for $1.80 and wants to spend the rest on dog biscuits that cost $0.60 each. How many can she buy?

To solve this equation we can simply subtract $1.80 from $30 and get $28.20. With the remaining $28.20 you can divided by $0.60 to get how many total dog biscuits your sister can buy. 28.20 divided by 0.60 is 47.

So your sister can buy 47 dog biscuits.