You would need approximately 5-8 pints of gravy to serve 80 people, depending on how much gravy each person typically uses. It's generally a good idea to have extra to account for preferences and second servings.
Many people say in the bottom of ponds or lakes.
There are about 236 calories in one can of gravy.
It depends on how many dishes you are serving needing gravy. For instance, meatloaf and mashed potatoes will need about 1/2 cup of brown gravy per portion. that would require about 3 gallons for 100 people. But, if you are also serving a chicken dish with a cream gravy, that may need another 2 gallons of cream gravy for 100 people. Normally I expect 1/3 cup gravy for each portion requiring gravy. so for 100 people per portion it's a bit more than 2 gallons of gravy.
there are round about 20,000,000 ponds approximately
500 such as strawberry and apple types or just original gravy's is how you spell MANY NOT Meny. OK!
About 80 pounds
Depends on how deep the ponds are.
That depends on the size of the ponds
Most gravy is not gluten free because of the use of white flour to thicken gravy. There are alternatives to this such as using a gluten free flour or cornstarch to thicken your gravy. There are many recipes for gluten free gravy online, just google it.
You question makes no sense, but if you are asking how many ozs of gravy granules to use to make gravy , then you need to follow the instruction on the tin or packet to get the correct amount for the volume of gravy you are making.
That is approximately 25 quarts,giving 2 oz gravy each.