A Sales Manager buys antacid in bottles by the gross. If he goes through 3 bottles of antacid everyd

A Sales Manager buys antacid in bottles by the gross. If he goes through 3 bottles of antacid everyday, how long will the gross last?

Calculate a gross
A gross equals 144 because 1 gross = 12 dozen
12 dozen * 12 items/dozen = 144

Answer
Days lasted = Total Bottles / Bottles per day
Days lasted = 144 bottles / 3 days
Days lasted = 48 days