How many bowls of dog food do you get in a 7lb bag? Best answer gets 10pts!!!!!?

I am looking into getting a shih tzu puppy, and am trying to figure out every cost that i would have so that when i ask my parents, we all know what we are getting into. I would probably get Purina Puppy Chow, due to good reviews of the food. Please let me know how many meals I would get in this amount so I can figure out costs...Thanks a million!!!