Let the maximum number of pages Jennifer can have be = x
Amount Jennifer has (P) = $62.10
Given equation is :
P = [tex](20+0.5x)+0.15(20+0.5x)[/tex]
Price is given = 62.10 , so equation is :
[tex]62.10=(20+0.5x)+0.15(20+0.5x)[/tex]
[tex]62.10=20+0.5x+3+0.075x[/tex]
[tex]62.10=23+0.575x[/tex]
[tex]0.575x=39.10[/tex]
[tex]x=68[/tex]
Hence, Jennifer can have a maximum of 68 pages in her book.