Answer:5/3 lbs or 1.666... lbs a month
Explanation:
5 lbs: 3 months is a ratio of lbs to months so in order to find how much Buster eats in 1 month you need to find a way to set the months = to 1
in order to do this you divide each side by 3
5/3=3/3
simplify the fractions and you get
5/3: 1