Respuesta :

[tex]\begin{gathered} \text{Initial numbers of books: 286 } \\ \text{Total number of books bought over a period of 5 months: 12 }\times\text{ 5 = 60} \\ \text{Total Number of Books in the Library is: 286 + 60 = }346 \end{gathered}[/tex]

RELAXING NOICE
Relax