Chickens like grass more than grain but 5 chickens will eat a 30 x 30 area down to bare dirt in 2 to 3 weeks. You have 11.
If you don't have much yard, then it can be fixed but you will have to supplement with grain, etc.
Save all of your table scraps they love them including meat and fat.. they eat everything better than a garbage disposal. Some things you will just ned to chop up by hand or in a blender to make it small enough.
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