Number of gallons of water produced each cay by the company = 7200 gallons
Number of 1 gallon bottles put in a carton = 8
Number of cartons needed to hold all the 1 gallon bottles in a day = 7200/8
= 900
So 900 cartons are required to hold all the one gallon bottles produced by the company in a day. I hope the procedure is clear enough for you to understand. It is also important to carefully look at all the details that are provided in the question.