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

### Instruction:
Adam has just bought some new books so he has decided to clean up his bookcase. After he adds his new books to his bookshelf he realizes that he has bought enough books to finish completely filling his bookcase with 2 books left over. Before his shopping trip, Adam had 56 books in his bookcase. If his bookcase has 4 shelves and averages 20 books per shelf, how many books did Adam buy on his shopping trip?

### Response:
 Rafu ya vitabu ya Adam ina rafu 4 ambazo zinafaa vitabu 20 kila moja, ambayo inamaanisha inaweza kubeba vitabu 4 * 20 = <<4*20=80>>80 jumla kujaza rafu ya vitabu.
Kabla ya safari yake ya kununua Adam alikuwa na vitabu 56 kwenye rafu yake ya vitabu, ambayo ilisalia vitabu 80 - 56 = 24 kununua Adam kujaza rafu yake ya vitabu.
Adam alimaliza kununua vitabu 24 kujaza rafu yake, na vitabu 2 vimebaki ambayo inamaanisha alinunua 24 + 2 = <<24+2=26>>26 vitabu jumla.