Answer:
[tex]12\ books[/tex]
Step-by-step explanation:
Number of books[tex]=15[/tex]
He read [tex]\frac{4}{5}[/tex] of the total books.
[tex]Books\ he\ read\ at\ the\ end\ of\ July &=\frac{4}{5}\times total\ number\ of\ books\\=\frac{4}{5}\times 15=4\times 3=12[/tex]