How much paint do I want to repaint the outside of a 10' X 50' mobile home beside a 12' X 12' adding up? ...

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Answers:    You might get by beside 6 gal. but I'm gonna say 7 merely to make sure AND this is "per coat". A lot is going to depend on the the standard of the paint you purchase, the condition and texture of the surface that you are painting and if one coat will cover it. If you purchase a wearing clothes quality paint and the surface is within fair condition and you are not doing a drastic color loose change then you should find by with one coat. Good Luck