Answer :
[tex]From\
proportion:\\\\5\ \ \ -\ \ \ 150\\4\frac{1}{2}\ \ -\ \ \ x\\\\5x=\frac{9}{2}\cdot150\\5x=675\ \ \ \ |:5\\x=135\\\\Emanuel\ would\ read\ 135\ pages.[/tex]
there is 10 half an hours in 5 hours
in 4 1/2 there are 9
so 150/10=15
15x9=135
in 4 1/2 there are 9
so 150/10=15
15x9=135