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You will have 24 volts DC.
a lot
Six (6) D size batterys.
The whole family
a whole family
One could purchase a whole house air purifier from many traditional and online stores. For instance, one could purchase a whole house air purifier from Sears, Lowe's, and AprilAire.
Well, it would depend on the size of the house. (:
There has been a resurgence of interest in generators over the past few years. The only problem with many of the generators on the market these days is that many of them don't seem suitable to run the electrical needs of an entire house. You need to run a special search if you are looking for a generator to power your whole house. Something simple like "generator whole house" will likely give you tons of great results.
There are many places that will sell you a whole house generator, including online sites and stores. You will be able to check out prices and find the appropriate generator to run your entire house in case of a power failure.
12 whole racks of ribs
I don't think there is an international survey for shops in the whole world. If there was, there would be a large margin of error as many shops would not be surveyed.
One hundred hundredths makes a whole.