Answer:
50 photographs
Step-by-step explanation:
[tex]\frac{5}{15} = \frac{x}{150}[/tex]
Solve using cross multiplication.
15x = 750
x = 50
There will be 50 photographs in a 150 pages cookbook.
OR
You know that [tex]\frac{1}{3}[/tex] of the pages are photos since 5 over 15 equals one third. Therefore, you can multiply 150 by [tex]\frac{1}{3}[/tex] to also get 50.