According to the problem, the ratio is 8 to 15, that is, for every 8 blue pens, there are 15 red pens.
If we call x red pens, then we can express the following
[tex]\frac{461,339-x}{x}=\frac{15}{8}[/tex]We solve for x.
[tex]8(461,339-x)=15x[/tex][tex]\begin{gathered} 3,690,712-8x=15x \\ 3,690,712=15x+8x \\ 23x=3,690,712 \\ x=\frac{3,690,712}{23}=160,465.7 \end{gathered}[/tex]