Please don't post general questions in homework & coursework unless you want it to be treated as such.
The problem is that the question is non-sense (which of course means it can't be homework in disguise hehe). It is like saying "How many houses that use 55 gallons of water per minute can I supply with 40,000 PSI of water." Volts is a kind of electrical pressure (although that's not really a good definition) whereas KiloWatt-hours is a kind of equivalency to "gallons" of water. It's impossible to say you can water such and such # of houses with 40,000 PSI using only the # of gallons used by each house because what you really need to know is one of the following; the required pressure for each house given a pressure/house requirement and a total pressure achievement (which means you would only be dealing with pressures and not how many gallons can actually be supplied) or how much a house needs in gallons vs. how many gallons you are capable of producing.
With electricity it's the same thing. You can either provide a certain # of houses with 120V of voltage knowing the starting voltage (say nothing towards how much actual energy you can provide) or the # of houses you can supply with energy given that you can produce x amount of energy per year.