 
<translate> O juru igbe atọ nwere akwụkwọ iri na ise n'otu n'otu, n'ihi ya, 3 * 15 = akwụkwọ iri anọ na ise. Site n'ụlọ ya fọdụrụnụ, ọ na-enye onyinye akwụkwọ 45 + 21 + 4 + 18 = 88 maka inye onyinye. Nchịkọta ya bụ akwụkwọ iri itoolu na itoolu ma ọ na-enye akwụkwọ iri asatọ na asatọ, nke mere na ọ hapụrụ ya akwụkwọ iri itoolu na itoolu - iri asatọ na asatọ = akwụkwọ iri na otu. Ọ na-eburu akwụkwọ iri na abụọ ka ọ gbakwunye na akwụkwọ iri na otu o nwere, ya mere, o nwere akwụkwọ iri na abụọ na otu na iri na otu bụ akwụkwọ iri abụọ na atọ. Azịza ikpeazụ ya bụ: 23. <eng> He filled 3 boxes with 15 books each so 3 * 15 = 45 books. From the rest of his house he is donating 45 + 21 + 4 + 18 = 88 books for donation. His collection is 99 books and he is donating 88 books, so that leaves him with 99 - 88 = 11 books. He picks up 12 books to add to his collection of 11 books so he now has 12 + 11 = 23 books.
The final answer: 23. 