Respuesta :
Answer:
[tex]5 \: \: \: \: books[/tex]
Step-by-step explanation:
[tex]3 = 330 \\ 1 = \frac{330}{3} \\ \: \: \: \: \: = 110 \\ \\ \\ x = 550 \\ 1 = 110 \\ cross \: \: multiple \\ 550 = 110x \\ \frac{550}{110} = \frac{110x}{110} \\ x = 5[/tex]