What is the best way to: How much dog food do you feed a medium sized dog weighing around 30 pounds for each meal?

Possible answers:
(a). They need about one cup of dried dog food, but will eat it better if you mix in about a half of cup of wet dog food with it much better.
(b). They need about 10 cups of dried dog food, but will eat it better if you mix in about a half of cup of wet dog food with it much better.
Answer:
(a).