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A sales manager buys antacid in bottles by the gross. If he goes through 3 bottles of antacid every day, how long will the gross last?

A 48 days

Do you even know what a gross is? It's a 12 dozen. Which basically mean 144. 12 x12 = 144 bottles are in a gross. 144 ÷ 3 (bottles per day) = 48 days.