<human>:  A bookseller sells 15 books in January, 16 in February and a certain number of books in March. If the average number of books he sold per month across all three months is 16, how many books did he sell in March?
<bot>: How many books did he sell in those 3 months? ** He sold an average of 16 books per month across all 3 months so he must have sold a total of 3*16 = <<16*3=48>>48 books in those 3 months
How many books did he sell in January and February? ** He sold 15+16 = <<15+16=31>>31 in January and February
How many books did he sell in March? ** He must have sold 48-31 = <<48-31=17>>17 books in March
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