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

### Instruction:
Nancy, the librarian, is shelving books from the cart. She shelved 12 history books, 8 romance books, and 4 poetry books from the top section of the cart. Half the books on the bottom section of the cart were mystery books, which she quickly put back into place. Then, she shelved the remaining books from the bottom of the cart, including 5 Western novels and 6 biographies. How many books did she have on the book cart when she started?

### Response:
 Nusu ya vitabu kwenye sehemu ya chini ya gari ni vitabu vya siri, ambavyo inamaanisha ni sawa na idadi ya vitabu vya magharibi na vitabu vya maisha pamoja. Hivyo kuna vitabu 5 + 6 = <<5+6=11>>11 vya siri.
Ongeza idadi ya vitabu vya historia, mapenzi, na mashairi kutoka sehemu ya juu ya gari, pamoja na vitabu vilivyosalia kutoka sehemu ya chini, na utapata vitabu 12 + 8 + 4 + 5 + 6 + 11 = <<12+8+4+5+6+11=46>>46 jumla ya vitabu.