Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
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?

### Response:
 Jumla ya vitabu ambavyo lazima awe ameviuza katika miezi yote 3 ni 16*3= <<16*3=48>>48 vitabu.
Idadi ya vitabu alivyoviuza mwezi wa Januari na Februari ni 15+16= <<15+16=31>>31 vitabu.
Lazima awe ameuza vitabu 48-31= <<48-31=17>>17 mwezi wa Machi.