Given:
A shop owner sold 27 books on Friday.
This was 9 more than the number of books he sold on Thursday.
Let, the number of books shop owner sold on thursday is x .
The eqaution is given as,
[tex]27=9+x[/tex]Now, solve the equation,
[tex]\begin{gathered} 27=9+x \\ x=27-9 \\ x=18 \end{gathered}[/tex]Answer: the number of books sold on thursday is 18.
