1. Boxes are stacked in a store display in the shape of a triangle. The numbers of boxes in the rows form an arithmetic sequence. There are 41 boxes in the 3rd row from the bottom, 32 boxes in the 12th row from the bottom. What is the maximum possible number of rows of boxes?

Can someone explain how to get this? Thanks

A: 23

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2. The time from one full moon to the next is 29.53 days. The first full moon of a year occurred 12.31 days into the year. At what time of the day did the 9th full moon occur?

I don't understand how to get the time... explain please and thank you

A: 13:12