Explanation
We are required to determine the cost of each pencil given that seven pencils cost #875.
This is achieved thus:
[tex]\begin{gathered} 7pencils=\text{ \#}875 \\ 1pencil=\text{ \#}\frac{875}{7}=\text{ \#}125 \\ \therefore each\text{ }pencil=\text{ \#}125 \end{gathered}[/tex]Hence, the answer is:
[tex]\text{ \#}125[/tex]