Let
y-------> number of books read during the month 
x------> number of picture of a book
we know that

in this problem
for 
calculate y

therefore
the answer is
The number of books read during the month
is 
Answer:
honey there is no picture to use...
Step-by-step explanation:
I believe the X numbers are divided by 2, to get the Y numbers. So the blank X box is 1 and the other is 12.